We keep on surrounding Centro Histórico. Now we're at the North, and find Unidad Habitacional Nonoalco-Tlatelolco, known to every one here only as "Tlatelolco", a working class neighborhood.
Tlatelolco was one of the autonomous cities of Greater Tenochtitlan, the capital of the Aztec empire.
The last Aztec emperor, Cuauhtémoc, was from Tlatelolco. Since the place is mostly tallish buildings, I've always imagined old Tlatelolco as a place with a lot of tallish piramids (which, of course, isn't true).
Tlatelolco's history is full of tragedies.
The first one we know of was the massacre of almost all the Aztec elite by Conquistador Pedro de Alvarado, while Cortés was away at Veracruz. This massacre ended the peace between Spaniards and Aztecs and led to the "Noche Triste", the Aztecs defeating the Conquistadores and their allies from Tlaxcala.
But other tragedies were to come.