Nonoalco-Tlatelolco (1964) is the largest apartment complex in Mexico and the second largest in North America. The plan, by architect Mario Pani, included 102 residential towers with plazas and public space in between. It was based on Le Corbusier's concept of towers in the park. Built as a mixed-income solution to a looming housing crisis resulting from urbanization, the city within a city included schools, recreation, businesses, gardens, hospitals, and art. The development was home to 80,000 people. Source: Browne Barnes Tlatelolco started as a city-state on the shore of Lake Texcoco and was overtaken by the ascendant Aztecs. During the conquest of Mexico by Cortés, in 1521, Tlatelolco was the last battleground between the Aztecs and the Spanish. Cortés's conquistadors won the fight, and 40,000 Aztecs were killed. There is now a plaque on the site that reads: “The battle was not a triumph, nor was it a defeat. It was the painful birth of the mestizon...