Mexico City: The Weight of History

Hernán Cortés had the entire ceremonial precinct demolished after the conquest of fifteen twenty-one. The siege of Tenochtitlán lasted seventy-five days. By the time the last Aztec emperor, Cuauhtémoc, was captured, the city had been almost completely destroyed. Cortés used the rubble and the dismantled temple stones to build the Cathedral you see on the north side of this square, and the Viceroy's Palace on the east side. The Spanish colonial city was built directly on top of the Aztec city, using its materials, following roughly its street grid. The layers have never been fully separated.

The name "Zócalo" — which just means plinth or base — comes from a peculiar story. In eighteen forty-three, a base for a monument to Mexican independence was installed in the centre of this square. The monument itself was never completed. Funds ran out, or the will ran out, or both. The lonely plinth sat here for years, and locals started calling the square "el zócalo" — the base. The name outlived the plinth, which was eventually removed, and eventually became the generic term for the main plaza of any Mexican city. Every city and town in Mexico has a zócalo. But there is only one Zócalo.

Every September fifteenth at eleven o'clock at night, the President of Mexico appears on the balcony of the Palacio Nacional — that long red building on the eastern edge of the square — and rings a bell three times. Then he shouts the Grito de Independencia, the Cry of Independence: "¡Viva México! ¡Vivan los héroes! ¡Viva la Independencia!" The crowd of two hundred thousand people packed into this square shouts back. The tradition commemorates Father Miguel Hidalgo's original grito of eighteen ten, which launched the Mexican War of Independence. It has been performed every year since, without interruption, through wars and revolutions and earthquakes and pandemics.

Look around this square. The Cathedral to the north. The National Palace to the east. The Federal District buildings to the south and west. And beneath your feet, a few metres down, the foundations of the Aztec world. That is what this tour is about.

Tenochtitlan was one of the largest cities in the world at the time of the Spanish conquest — with a population estimated at around two hundred thousand people, it was bigger than any city in Europe. The Aztecs built chinampas — artificial garden islands in the lake — to grow enough food to feed this population. Aqueducts carried fresh water in from the springs at Chapultepec. Great causeways connected the island to the mainland, wide enough for ten people to walk abreast.

The Spanish tore the city down stone by stone after fifteen twenty-one, filled in the lake, and built their colonial capital directly on top of it. Every colonial building you see around you is resting on Aztec foundations. The Metropolitan Cathedral to your north was built with stones dismantled from Aztec temples. The National Palace to your east sits on the site of Moctezuma's palace.

The name Zócalo is actually a nickname. In the nineteenth century, a pedestal — a zócalo in Spanish — was erected here as the base for a monument that was never built. The pedestal stood empty for years, then was removed, but the name stuck. Now every main square in Mexico is called a zócalo, in reference to this one.

Every September fifteenth at eleven in the evening, the President of Mexico appears on the balcony of the National Palace and rings a bell and shouts the Grito de Independencia — the Cry of Independence. The crowd of hundreds of thousands packed into this square shouts back. The tradition commemorates Father Miguel Hidalgo's original cry of eighteen ten, which launched the Mexican War of Independence from Spain.

Look around you slowly. The Cathedral to the north. The National Palace to the east. Beneath your feet, just a few metres down, the foundations of the Aztec world. That is what this tour is about.

What they found was the Templo Mayor: the Great Temple of Tenochtitlán, dedicated jointly to Huitzilopochtli on the southern half and Tlaloc, the god of rain and water, on the northern half. The duality was deliberate — war and agriculture, the dry season and the wet season, the two forces that governed Aztec life. The temple was aligned precisely so that on the spring and autumn equinoxes, the sun rose exactly between the two shrines at the top.

The temple had been built and rebuilt seven times over approximately two hundred years, each new version encasing the previous one like a set of Russian dolls. The archaeologists found them all, one inside the other, each with its own offerings and sculptures. The earliest version dates to around thirteen twenty-five — the legendary year of the founding of Tenochtitlán, when the Aztecs, following divine instruction, saw an eagle perched on a cactus devouring a serpent, which is still the symbol of Mexico on its flag.

The offerings buried within the temple layers tell the story of an empire. Thousands of objects have been excavated from the site: jade masks, obsidian blades, coral and shells from distant oceans, eagle warrior sculptures, the skulls of sacrificed children offered to Tlaloc in exchange for rain. Archaeology has confirmed what the documentary record suggested — that human sacrifice at this temple was extensive, systematic, and tied to the agricultural and astronomical calendar. The largest known offering deposit, found in twenty seventeen, contained the remains of sacrificed animals and humans in a layer buried around fifteen hundred AD.

The museum on the southern edge of the site is outstanding. The Coyolxauhqui Stone is displayed in a dedicated circular room — it is one of the great works of pre-Columbian art, a masterpiece of composition and craft. The eagle warrior sculptures — life-size ceramic figures of warriors dressed in eagle feathers, their faces emerging from the open beaks of eagles — are haunting in their power. Allow at least an hour for the museum if you can.

Standing here, you can see the layers of the city simultaneously: the Aztec stones at the base of the excavation, the colonial walls that were built on top of them, and the modern city rising behind. Nowhere else in Mexico City is the palimpsest this visible.

The excavation that followed demolished an entire colonial-era city block to expose what lay beneath: the Templo Mayor, the Great Temple of Tenochtitlan. It was dedicated jointly to Huitzilopochtli on the south side and Tlaloc, the god of rain and agriculture, on the north side. War and water — the two pillars of Aztec survival. The temple was aligned so that on the spring and autumn equinoxes, the sun rose precisely between the two shrines at the summit.

The temple had been built and rebuilt seven times over approximately two hundred years. Each Aztec ruler constructed a new version encasing the previous one, like a series of nesting dolls in stone. The earliest version dates to around thirteen twenty-five — the legendary year of the founding of Tenochtitlan itself.

The offerings buried within the temple layers tell the story of an empire. Thousands of objects have been excavated: jade masks, obsidian blades, coral and shells imported from distant coasts, eagle warrior sculptures, ceramic figures, the skulls of sacrificed animals and humans. The Aztecs believed the sun required blood to rise each morning and the rains required sacrifice to fall — the cosmos had to be maintained through human effort and human death.

Look down into the open excavation now. You can see the layered construction, the stone serpent heads, the original painted surfaces. The adjacent museum displays the Coyolxauhqui Stone in its own dedicated room — one of the great masterworks of pre-Columbian art. The eagle warrior sculptures, life-size ceramic figures of warriors in eagle feather costume, their faces emerging from the open beaks of eagles, are haunting in their power.

The site sits at an extraordinary intersection. To your left is the Metropolitan Cathedral, its baroque towers rising above the corner of the Zócalo — built with stones quarried from this very temple, a deliberate act of erasure that is visible in every dressed stone of the Cathedral's foundation. The Spanish wanted to make the point permanent and architectural: here is what replaced what you worshipped. And yet the Templo Mayor endured underground, and now it lies exposed again in the full light of day, and the Cathedral is the one that is visibly sinking.

Standing here you can see several centuries simultaneously: Aztec stones at the base of the excavation, colonial walls built directly on top of them, and the modern city rising behind. Nowhere else in Mexico City is this layering so visible or so raw. This is the most honest place in a city full of superimpositions.

You enter through the central door under the national coat of arms. Go straight to the main staircase. Nothing can prepare you for it.

Diego Rivera painted the staircase walls between nineteen twenty-nine and nineteen thirty-five — three enormous walls that together comprise his masterwork, "Epic of the Mexican People in Their Struggle for Freedom and Independence." The central wall shows the history of Mexico as a continuous narrative from left to right: the Aztec world, lush and ordered, at the top; the conquest in the middle, Cortés surrounded by priests and soldiers and weapons; the colonial period with its forced labour and racial hierarchy; independence and the liberal reforms of Juárez; the Revolution of nineteen ten; and at the bottom, the socialist future Rivera believed was coming. At the very centre of the composition, above the archway, Karl Marx points toward the horizon. Rivera was a committed communist his entire life and was not subtle about it.

The north and south walls were completed later, between nineteen forty-two and nineteen fifty-one, when Rivera was in his sixties. The north wall depicts the Aztec world in extraordinary detail — the chinampas, the market of Tlatelolco, the ceremonial life of Tenochtitlán — painted with such ethnographic precision that historians and archaeologists still use it as a reference. Rivera based the details on codices and archaeological evidence, consulting scholars and correcting errors over decades of work.

Rivera painted these murals in true fresco — pigment applied to wet plaster, which bonds chemically with the wall as it dries. Once the plaster sets, the paint cannot be altered or corrected. Each section had to be completed within a single working session while the plaster was wet. A large section might take twelve hours of continuous work. Rivera spent twenty-two years on this staircase.

The building is free to enter with a passport. You can walk the entire ground floor colonnade, look into the gardens, and spend as long as you want with the murals. There is no other collection of public art in Mexico that matches this for ambition and historical scope.

Diego Rivera painted the staircase walls between nineteen twenty-nine and nineteen fifty-one — three enormous walls that together form his masterwork, known as the Epic of the Mexican People in Their Struggle for Freedom and Independence. The central wall tells the history of Mexico as a continuous visual narrative: the Aztec world at the top, lush and ordered; the conquest in the middle, with Cortés surrounded by priests, soldiers, and weapons; the colonial period with its forced labour and racial hierarchy; independence; revolution; and at the bottom, a socialist future that Rivera passionately believed was coming.

Rivera was a communist his entire life and was not subtle about it. At the very centre of the composition, directly above the main archway, Karl Marx points toward the horizon. At the top left corner, Rivera painted the Aztec world in extraordinary detail — the great market of Tlatelolco, just north of the Templo Mayor, with merchants trading cacao, quetzal feathers, jade, textiles, and produce. He based the details on historical codices and consulted archaeologists over decades of work.

Rivera painted in true fresco — pigment applied to wet plaster, bonding chemically with the wall as it dries. Once set, nothing can be altered. Each section had to be completed in a single working session while the plaster was still wet. He spent twenty-two years on these walls.

Rivera's own life was as dramatic as his paintings. He was married to Frida Kahlo, themselves the two most famous artists in Mexican history, in a relationship so turbulent and mutually destructive that when they divorced and then remarried, their friends considered it the obvious outcome. Rivera had affairs. Kahlo had affairs, including with the exiled Russian revolutionary Leon Trotsky, who lived in Coyoacán just south of the city. Rivera was a physically enormous man — nearly one hundred and eighty centimetres tall and very wide — with small, protuberant eyes that Kahlo described as frog eyes, meaning it as a compliment. The murals in this building contain his entire philosophy, which was that art existed to educate the poor and celebrate the indigenous heritage that colonialism had tried to destroy.

The Palacio Nacional is free to enter with a passport. You can walk the entire colonnade, see the gardens, and spend as long as you like with the murals. There is no other collection of public art in Mexico that matches this for ambition, scope, or historical weight.

The cathedral was built directly over the Aztec ceremonial precinct, on the northern edge of the Templo Mayor complex, using stones dismantled from Aztec temples. Archaeologists have identified Aztec carved stones embedded in the foundations. The symbolic purpose was explicit — the Christian church planted on the ruins of pagan sacrifice, the new world order made literal in stone.

But the ground is not stable. Tenochtitlán was built on an island in a lake, and the lake was never fully conquered — it was drained over centuries, but the subsoil is still saturated clay, highly compressible. The cathedral sits on a foundation of wood pilings driven into the lakebed in the sixteenth century. As the city pumps groundwater from the aquifer beneath it, the clay compresses, and the city sinks. The cathedral has been sinking since sixteen twenty-five, and it has not sunk evenly — different parts of the building sit on different soils and have subsided at different rates. The whole structure is visibly tilted. If you look at the floor inside, you can feel the gentle slope.

The Mexican government spent much of the nineteen nineties and two thousands working to stabilize the cathedral. They drilled hundreds of shafts beneath the structure, extracted water from the subsoil to allow it to dry and compact more uniformly, and injected grout to consolidate the foundation. The sinking has been slowed but not stopped.

Inside, the Altar of Forgiveness near the west entrance is a spectacular Baroque retablo — an altarpiece — in gilded carved wood, with a painting of the Assumption of the Virgin at its centre. The Altar of the Kings at the east end, completed in seventeen thirty-seven by Jerónimo de Balbás, is considered the finest Baroque altarpiece in Mexico — a cascade of gilded curves and figures that covers the entire east wall. It is called the Altar of the Kings because two kings and two queens of Spain are interred beneath it.

Attached to the east side of the cathedral is the Sagrario Metropolitano, a separate church built between seventeen forty-nine and eighteen sixty-eight. Its facade is the finest example of churrigueresque architecture in Mexico — the Spanish Baroque taken to its absolute extreme of ornamental density, every surface covered in carved stone figures, foliage, and geometric pattern. Stand in front of it and try to find a square centimetre of plain stone. You will not.

Step inside. The interior is vast and dark. Fourteen side chapels line the nave, each with its own retable — a carved altar screen rising floor to ceiling in gilded woodwork and painted saints. The Altar de los Reyes at the far end is a Churrigueresque explosion: a wall of carved and gilded wood so densely decorated it seems alive, with saints, angels, columns, and cherubs competing for every centimetre.

Now look at the floor. It tilts. The columns lean. Mexico City is built on the dried bed of Lake Texcoco, and the soft clay beneath the city has been compressing under the weight of colonial construction for five centuries. The cathedral has been sinking since at least the seventeenth century, and it has not sunk evenly — different sections sit on different soils and have subsided at different rates. A pendulum installed in the nave measures the building's ongoing movement in real time.

The whole city is sinking. In some neighbourhoods Mexico City descends by roughly thirty centimetres per year, the result of pumping groundwater from the ancient lake bed. Streets buckle, buildings lean, pipes crack. It is one of the world's great slow-motion geological dramas, and this cathedral has been living it for longer than any other building in the city.

A major engineering project in the nineteen-nineties and two thousands partially corrected the tilt — engineers drilled hundreds of shafts beneath the structure and extracted soil selectively to allow the heaviest sections to settle further and catch up with the rest. The cathedral remains a building in permanent negotiation with the ground beneath it.

The cathedral also survived the nineteen eighty-five earthquake, though the trembling cracked stonework and damaged the towers. That earthquake, which struck at magnitude eight-point-one, killed thousands of people across the city. Entire apartment buildings pancaked. Hospitals collapsed with patients inside. The soft lake sediments beneath Mexico City amplified the seismic waves, turning what might have been a damaging earthquake in another city into a catastrophic one in this particular location. The cathedral's massive stone construction, paradoxically, helped it survive — all that weight pressed the foundations into the clay in ways that held rather than buckled.

Stand at the main entrance and look toward the altar. Feel the slope. Let that tilt — that gentle, decades-long lean of this enormous building — be your reminder that the geology always wins in the end.

But the site holds historical weight far older than the building. This is where Moctezuma's aviary once stood — the legendary collection of birds maintained by the Aztec emperor, said to contain specimens from every corner of the empire, tended by hundreds of keepers. Bernal Díaz del Castillo, who walked these grounds with Cortés in fifteen nineteen, described the aviary in detail: rooms for birds of prey, pools for waterfowl, trees hung with the nests of singing birds, an entire wing for the quetzal whose feathers were more valuable than gold in Aztec culture.

Stand here on this corner and think about the compression of history. An Aztec imperial aviary became a Spanish colonial charitable institution that is still a functioning pawnshop five centuries later. Mexico City is full of these layerings — places where the continuity between worlds is almost too much to hold in one thought at once.

The silver that made Romero de Terreros rich enough to found the Monte de Piedad came from the mines of Hidalgo state, north of Mexico City — some of the richest silver deposits in the world, worked from the sixteenth century onward by indigenous labour under conditions of extraordinary brutality. New Spain produced roughly a third of the world's silver during the colonial period, and much of that wealth flowed through Mexico City on its way to Spain. The Monte de Piedad was, in that sense, a charitable institution funded by a fortune built on coerced labour — a complexity that the institution's motto did not address and that Mexico has been working through ever since.

The smell of marigolds from the flower sellers at the edge of the Zócalo drifts over. Marigolds are the flower of the dead in Mexico, their strong scent believed to guide spirits home during Día de los Muertos. The market stalls selling them never quite disappear from this corner, even outside the November holiday season. Their orange colour and their smell are as much a part of this corner as the carved limestone facade.

The interior is even more extraordinary. The atrium rises five storeys, flooded with light from a glass roof, with galleries on each level connected by staircases of ornate wrought iron and brass. The metalwork — the balustrades, the window frames, the column capitals, the postal boxes — is a masterwork of late-Victorian craft, all manufactured in Italy and shipped to Mexico for assembly. The first time you see it, the shock of finding this interior behind that exterior in the middle of Mexico City is considerable.

The building was commissioned by Porfirio Díaz as part of his campaign to modernize and aggrandize Mexico City in preparation for the centenary of independence in nineteen ten. Díaz had governed Mexico for thirty-one years by that point — two terms as president separated by a legal interval, then continuous rule from eighteen seventy-six to nineteen eleven under a system of managed elections and suppressed opposition. He was a Oaxacan general who had fought the French, a skilled political operator who brought foreign investment, railways, and modern infrastructure to Mexico while crushing labour movements and concentrating land in the hands of a small elite. He wanted the centenary to announce Mexico's arrival as a modern nation.

So he commissioned the Palacio Postal. He commissioned the Palacio de Bellas Artes, which you will see next. He commissioned grand boulevards, monuments, and government buildings throughout the centro. He invited foreign dignitaries to elaborate ceremonies. And then, in the very year the celebrations were held — nineteen ten — Francisco Madero launched the revolution that would overthrow him. By nineteen eleven, Díaz was in exile in Paris, where he died in nineteen fifteen. The buildings he commissioned outlasted him by more than a century.

The post office still functions as a post office — you can buy stamps and send postcards from one of the most beautiful postal buildings in the world. The museum on the upper floor is free to enter and displays the history of the Mexican postal service. The ground floor atrium is open to visitors at no charge. Walk in, look up, and appreciate the brass.

Madero Street was the commercial heart of colonial Mexico City for three centuries. The buildings lining it were constructed in the seventeenth and eighteenth centuries as the homes and shops of the colonial merchant class — wealthy Spaniards and criollos who grew rich from the silver trade that made New Spain the most valuable colony in the world. The facades are baroque limestone, many now painted in the ochres and terracottas that characterise the colonial palette.

As you walk, notice the church towers rising above the roofline. The Centro Histórico contains dozens of colonial churches within a few blocks. The Spanish built churches aggressively in the first decades after the conquest, often directly over Aztec temples, using indigenous labour and Aztec stone. The indigenous craftsmen who built them sometimes embedded elements of their own visual vocabulary into the baroque carvings — corn cobs, marigolds, jaguar faces — hidden in plain sight among the Christian iconography, a subtle resistance that art historians have been identifying for decades.

The street is alive with vendors, taco stands, juice bars, and the smell of corn tortillas cooking on a flat iron griddle called a comal. The sound of cumbia music thumps from a passing sound system. A woman sells tejate from a giant clay bowl — a pre-Hispanic chocolate drink made from cacao and mamey sapote seeds, cold and earthy and unlike anything from a Starbucks. Street food in Mexico City is not a sideshow; it is the main event. This food culture has been continuous since before the conquest, adapted but never interrupted, and Madero Street has been one of its arteries for five hundred years.

Look into the doorways of the colonial buildings as you pass. Behind many of those facades are interior courtyards — light-filled patios with fountains and bougainvillea, hidden from the street, the architectural secret that colonial cities kept from outsiders.

Then the Revolution of nineteen ten happened. Construction stopped. Boari went back to Italy. The building sat as a marble shell for two decades. When work resumed in the nineteen twenties under the post-revolutionary government, tastes had changed completely. The interior was redesigned by Federico Mariscal in the Art Deco style that was then dominant — all geometric lines, Egyptian motifs, stepped forms, and bold colour. The result is a building that is Art Nouveau on the outside and Art Deco on the inside, which should be a disaster and is instead one of the most compelling interiors in Mexico.

The upper floors contain murals by the four great masters of Mexican muralism. Diego Rivera painted "Man at the Crossroads" — a recreation. The original was commissioned for Rockefeller Center in New York in nineteen thirty-three. When Nelson Rockefeller discovered that Rivera had included a portrait of Lenin in the composition, he asked Rivera to remove it. Rivera refused. Rockefeller had the mural destroyed. Rivera repainted it here in nineteen thirty-four, this time including not just Lenin but Rockefeller himself, seated at a lunch table next to syphilis bacteria. José Clemente Orozco's murals are perhaps the most emotionally powerful — dark, anguished visions of conquest and suffering. David Alfaro Siqueiros's mural covers an entire curved wall. Rufino Tamayo's two panels are quieter and more abstract, exploring indigenous symbolism through a European modernist lens.

The glass curtain of the main theatre is the building's most celebrated technical achievement — a mosaic of nearly a million pieces of opalescent Tiffany glass depicting the Valley of Mexico with Popocatépetl and Iztaccíhuatl volcanoes, created in nineteen thirty-four by the Tiffany Studios of New York. On Sunday mornings it is illuminated and raised — a forty-minute ceremony attended by hundreds of people. If you are here on a Sunday, go in for the curtain.

The building is worth entering even if only to stand in the main hall and feel the scale of the ambition.

The building is now a branch of Sanborns — a Mexican institution somewhere between a diner and a department store that has occupied this building since nineteen seventeen. Go inside. The interior courtyard, with its carved stone arches, its Moorish tilework, and its Diego Rivera mural on the staircase wall — painted in nineteen twenty-five, early in his career — is one of the most beautiful restaurant interiors in Mexico City. The mural depicts the god Quetzalcóatl, the feathered serpent who runs through Aztec mythology like a central nerve and whose promised return, according to some accounts, is what caused Moctezuma to hesitate when the Spanish first arrived.

Order a coffee or a fresh lime juice and sit for a moment in the courtyard. The sound of the street — diesel fumes and cumbia and the percussion of a hundred footsteps on stone — drops away. The light comes down from the glass roof above. In a city that moves at a relentless pace, this courtyard offers something rare: an actual pause.

The Talavera tile tradition itself is worth a thought. Talavera pottery was brought to the Puebla region by Dominican friars in the sixteenth century, who imported the technique from Talavera de la Reina in Spain, which had in turn imported it from the Moorish potters of North Africa. So the blue and white tiles on this building trace a path from Mexico to Spain to the Islamic world and back, another layer of the colonial exchange that shaped everything you see in this city.

In the colonial period, the Alameda was a park for the Spanish elite. Indigenous people were formally excluded. The social stratification of the colonial caste system — which classified people by their precise proportion of Spanish, indigenous, and African ancestry and assigned them corresponding rights and restrictions — was performed and enforced in spaces like this one. The elite came to promenade, to be seen, to display their rank.

On this same ground, the Inquisition held its Auto-da-fé — the public ceremony of judgment in which those convicted of heresy were sentenced and, in some cases, burned at the stake. The Alameda was the site of several such ceremonies. The ground you are walking on has seen things.

After independence in eighteen twenty-one, the park was opened to all citizens regardless of race, and over the following decades it was beautified in the Neoclassical style fashionable in the nineteenth century — formal flower beds, bronze fountains, white marble statues of classical figures and allegorical virtues, and the iron benches that are still here, still occupied. The great muralist Diego Rivera painted "A Sunday Afternoon Dream in the Alameda Central" in nineteen forty-seven — a panoramic work in which figures from across Mexican history mingle in this park, including Rivera himself as a child with Frida Kahlo behind him, and a skeletal Catrina — the elegant skeleton woman who has become the symbol of Día de los Muertos — in a feathered hat. The painting is displayed in the Museo Mural Diego Rivera at the western end of the park.

At the western end of the Alameda stands the Hemiciclo a Juárez — a semicircular white marble monument to Benito Juárez, the most important Mexican president of the nineteenth century. Juárez was born in a Zapotec-speaking village in Oaxaca in eighteen hundred and six, the son of indigenous farmers who died when he was three. He taught himself Spanish, trained as a lawyer, entered politics, and rose to become president. He reformed the Mexican constitution to separate church and state, nationalized church property, withstood the French military intervention of eighteen sixty-one to eighteen sixty-seven, and had the French-installed Emperor Maximilian executed. He is the great hero of Mexican liberalism and democracy, and is considered by many Mexicans the greatest president in their history. He is to Mexico what Lincoln is to the United States — a self-made man of humble origins who preserved the republic in a time of war.

The engineers who designed the Torre Latinoamericana — Adolfo Zeevaert and Nathan Cohn — solved the problem by going deep and going flexible. They drove four hundred steel piles thirty-three metres into the subsoil, below the soft clay layer into firmer ground. They designed a floating foundation that distributes the building's weight across the soft ground while allowing the building to move rather than crack. The structure itself was designed to flex — to sway with the earthquake waves rather than resist them — within carefully calculated limits.

On September nineteenth, nineteen eighty-five, a magnitude eight-point-one earthquake struck Mexico City at seven nineteen in the morning. It was one of the most destructive urban earthquakes in the twentieth century. Buildings collapsed across the city. The death toll is still disputed — official figures said about five thousand, but independent estimates ran as high as forty thousand. Entire apartment buildings pancaked. Hospitals collapsed with patients inside. The government's response was so inadequate that citizens organised their own rescue operations, an experience that transformed Mexican civil society and is credited with planting the seeds of the democratic movement that eventually ended the PRI's seventy-one-year monopoly on power.

The Torre Latinoamericana survived the earthquake with no structural damage. Buildings all around it collapsed. The engineering held. It remains one of the most cited examples of successful seismic engineering in history.

The observation deck on the forty-fourth floor — about a hundred and eighty metres up — is the best place to understand the geography of Mexico City. On a clear day, you can see the volcanoes: Popocatépetl, fifty kilometres to the southeast, still actively venting gas and ash, its summit perpetually white with snow. Beside it, the extinct Iztaccíhuatl — the "sleeping woman" in Nahuatl — whose ridgeline does indeed resemble a reclining figure. The city extends in every direction further than you can see — twenty-two million people, the largest metropolitan area in the Western Hemisphere. From up here, you can understand what it means to stand in the capital of a civilisation.

The upper floors contain murals by the great masters of Mexican muralism. Diego Rivera's mural here is a recreation. The original was commissioned in nineteen thirty-three for the lobby of Rockefeller Center in New York. When Nelson Rockefeller discovered that Rivera had included a portrait of Lenin in the composition, he demanded its removal. Rivera refused. Rockefeller had the mural destroyed. Rivera came back to Mexico and repainted it here, this time including not just Lenin but Rockefeller himself, seated at a lunch table next to syphilis bacteria under a microscope. He called the new version Man, Controller of the Universe. It is one of the great gestures of artistic defiance in the history of public art.

José Clemente Orozco's murals are perhaps the most emotionally devastating — dark, anguished visions of conquest and suffering, painted with a fury that Rivera's political optimism never quite matched. David Alfaro Siqueiros and Rufino Tamayo also have major works on the upper floors.

The building has been sinking since construction began. It now sits several metres lower than the surrounding streets, so you walk down steps to enter rather than up. In Mexico City, even the grandest buildings negotiate with the ground beneath them. That is the condition of the city.

It was cast in Mexico City between seventeen ninety-one and seventeen ninety-six, designed by the Spanish sculptor Manuel Tolsá, who also designed the dome of the Metropolitan Cathedral. It is the finest Neoclassical bronze sculpture in Latin America — technically superior to almost anything produced in Europe at the same period, which is why it has always been a source of pride regardless of the fact that it depicts a Spanish king. At the time of casting, Mexico was still a Spanish colony, and the statue was intended to glorify the colonial order. After independence in eighteen twenty-one, the statue was seen as an embarrassment — a monument to the coloniser installed in the centre of the newly free republic. It was moved to the courtyard of the university, then to the courtyard of a hospital, then to the Alameda, then to various other locations, before finally arriving here.

The collection inside spans four centuries of Mexican art and is essential to understanding the visual culture of this country. The colonial religious paintings of the sixteenth and seventeenth centuries — enormous canvases of the Virgin, the saints, and the Passion of Christ — show the extraordinary technical skill of artists working in the tradition of Spanish Baroque, often with indigenous faces beneath European costumes. The eighteenth-century portraits show the casta system — the elaborate racial classification of colonial society — in precise detail.

The landscapes of José María Velasco are among the most important paintings in the collection. Velasco painted the Valley of Mexico from the eighteen sixties to the early nineteen hundreds — a broad, luminous valley with Popocatépetl and Iztaccíhuatl in the distance, and in the middle ground, the remains of Lake Texcoco, which was still being drained in his lifetime. His paintings show a landscape that no longer exists — a valley half-filled with water, the city a relatively modest presence, the volcanoes dominating the horizon. They are records of an ecological transformation as much as works of art.

The nineteenth-century rooms document the birth of Mexican national identity through painting — history paintings of the conquest and independence, portraits of liberal heroes, allegories of the new nation. This is where you see Mexico deciding, through art, what it wanted to remember and how it wanted to see itself.

Beyond the exotic items that get the most attention, the market is a showcase of everyday Mexican ingredients at their best: chillies in dozens of varieties, from the mild pasilla to the scorching habanero, hanging in garlands of red and green and yellow; tropical fruits from the hot lowlands — pitahaya, mamey sapote, guanábana — that do not survive the refrigeration required for export; fresh cheeses from Oaxaca and Chihuahua; mole pastes ground to order from dried chillies, chocolate, and spices.

Eat here. Most stalls are combination delicatessens and restaurants — you choose your ingredients and they prepare them at the counter. Order a taco with huitlacoche, or a ceviche from the seafood counter, or a small plate of chapulines with a mezcal. Mexico City's food culture is one of the great food cultures of the world, and this market is one of its honest, unselfconscious centres. Chefs eat here on their days off. That tells you everything you need to know.

The market sits in a quiet block just south of the main tourist circuit, which means the crowds are thinner and the prices are lower than at more prominent food destinations. Come on a weekday before noon for the most relaxed experience. The smell of fresh tortillas and charcoal and lime is constant, and it is one of the better smells available anywhere in the city.

Maximilian was captured by the forces of Benito Juárez in eighteen sixty-seven and executed by firing squad in Querétaro on June nineteenth. His wife Carlota, who had returned to Europe to beg for military support and received none, went mad with grief and lived until nineteen twenty-seven — sixty years after her husband's death, in a Belgian castle, increasingly detached from reality. The boulevard Maximilian built is still here. The palace where he lived is still here. He is buried in Vienna.

The Ángel de la Independencia stands at the junction of Reforma and Rio Tiber, on a traffic roundabout that becomes, on days of national celebration, the spontaneous gathering point for half the city. The monument is a thirty-six-metre column of Carrara marble topped with a bronze statue of a winged woman — Nike, the goddess of victory — her wings spread, her right arm raised holding a laurel wreath. She is gold, or rather she is bronze covered in gold leaf that has been repaired and regilt after earthquakes and weathering. She is the most recognizable symbol of Mexico City.

The column was inaugurated on September sixteenth, nineteen ten, by Porfirio Díaz — the hundredth anniversary of the Grito de Independencia, the centerpiece of his centenary celebrations. The names of the heroes of Mexican independence are engraved on the base. In the crypt below the column are the actual remains of some of those heroes: Miguel Hidalgo, José María Morelos, Vicente Guerrero, and others who led the eleven-year war of independence that ended Spanish rule in eighteen twenty-one.

Díaz watched the inauguration of this monument in September. By May nineteen eleven he was in exile, never to return.

When Mexico's national football team scores at a World Cup, when a Mexican boxer wins a world championship, when something happens that makes twenty-two million people want to be together, they come here. The roundabout fills, then the boulevard fills, then the surrounding streets fill. People climb the column, wave flags, embrace strangers. The Ángel watches from above.

This is the end of the tour. Behind you is the history — five centuries of conquest, resistance, revolution, and reconstruction. Ahead of you is Chapultepec Park and the museum of anthropology, if you have the legs for it. You have walked through the most layered city in the Americas. The stones remember everything.

After Mexican independence in eighteen twenty-one the park was opened to all citizens regardless of race, beautified in the Neoclassical style fashionable in the nineteenth century — formal flower beds, bronze fountains, marble statues, and the iron benches still here today.

Diego Rivera painted A Sunday Afternoon Dream in the Alameda Central in nineteen forty-seven — a panoramic mural in which figures from across Mexican history mingle in this park: Rivera himself as a boy, Frida Kahlo behind him with her hand on his shoulder, the skeletal Catrina in a feathered hat on his other side. The Catrina is the figure that has become the symbol of Día de los Muertos — the Day of the Dead. The holiday, observed on the first and second of November, is Mexico's most distinctive cultural tradition: a multi-day celebration in which families build altars for their dead relatives, decorated with marigolds whose strong scent is believed to guide the spirits home, alongside photographs, favourite foods, and objects the deceased loved. The holiday blends Aztec ceremonies for the dead with the Catholic feasts of All Saints' Day and All Souls' Day into something entirely and specifically Mexican.

The nineteen eighty-five earthquake — a magnitude eight-point-one that struck on September nineteenth at seven in the morning — killed thousands of people in Mexico City and destroyed large sections of the Centro Histórico you have been walking through today. The government's slow and inadequate response galvanised civil society in a way that transformed Mexican politics. The neighbourhood organisations that formed in the earthquake's aftermath became the foundation of the democratic movement that eventually ended the ruling party's seventy-one-year hold on power.

Sit on a bench under these old trees. You have walked the ancient and colonial heart of one of the great cities of the world. Tenochtitlan is under your feet. The Spanish colonial city surrounds you. The modern Mexican republic is in motion all around you — diesel fumes and cumbia music and the smell of marigolds carried on the mountain air. Buy a corn from one of the vendors. Watch the city go by.