Chapultepec Castle (Museo Nacional de Historia)

Chapultepec Castle is the only royal castle in the Americas — built in 1785 as a viceregal summer house on a hilltop that Aztec emperors had used as a retreat, later serving as a military academy, a presidential residence (Emperor Maximilian and his wife Carlota furnished it in European style during their brief, tragic reign), and since 1944 the National Museum of History.

The museum covers Mexican history from the Spanish conquest to the Revolution, displayed in the castle's ornate rooms — including Maximilian and Carlota's personal chambers, furnished with their original European furniture and hung with portraits that radiate the oblivious elegance of an imposed monarchy that didn't last four years. The mural by Siqueiros in the main hall — 'From the Dictatorship of Porfirio Díaz to the Revolution' — covers an entire wall in the explosive, aggressive style that makes Siqueiros the most physically intense of the Mexican muralists.

The castle's terrace provides the best view in Mexico City — a panoramic sweep from the Paseo de la Reforma stretching east to the Centro Histórico, with Chapultepec Park's 800-year-old ahuehuete trees directly below and the ring of volcanic mountains on the horizon. The walk up to the castle from the park entrance takes about 15 minutes through the shaded forest, and the combination of the climb, the view, and the history — from Aztec emperors to Carlota's madness to the Niños Héroes — makes Chapultepec Castle one of the most emotionally layered sites in the city.