One more of Mexico City's crucial historic squares may be the Square of your 3 Cultures (Plaza de las Tres Culturas). The square occupies the site of the main sq. in the Pre-Columbian city of Tlatelolco plus the scene of the last desperate stand from the Aztecs in 1521 - https://vacationspots32097.dgbloggers.com/28158192/mexico-holiday-spots-an-overview