Archivo General de Indias

Every piece of paper that shaped the colonization of the Americas — treaties, letters, maps, ship manifests, death warrants — ended up here. The General Archive of the Indies holds more than 80 million original document pages stored on eight kilometres of shelving, making it the single most important repository of colonial history in the world. When historians want the original Treaty of Tordesillas that divided the New World between Spain and Portugal, they come to this building. When they want to read Columbus's handwriting or study maps drawn by Magellan, they come here too.

The building itself predates its archival mission by two centuries. It was designed in 1572 by Juan de Herrera — the same architect who built the Escorial for Philip II — as the Lonja de Mercaderes, the merchants' exchange where Seville's traders conducted business during the city's golden age as gateway to the Americas. The elegant Renaissance structure, with its open courtyard and harmonious proportions, was one of the finest commercial buildings in Europe until trade shifted to Cadiz in the eighteenth century.

King Carlos III ordered the conversion in 1785, consolidating colonial documents that had been scattered across archives in Simancas, Cadiz, and elsewhere. The idea was radical for its time: a single, centralized repository of imperial knowledge. The original wooden shelving, designed by the master carpenter Blas Molner, is itself a work of art — floor-to-ceiling mahogany cases that line the upper galleries.

The archive was included in the 1987 UNESCO World Heritage listing alongside the cathedral and Alcazar. Entry is free, and the ground-floor exhibition rotates original documents — you might see a letter from Hernan Cortes to the king or a map of a Caribbean island drawn before anyone in Europe knew the Pacific Ocean existed.