aka: Huēyi Teōcalli or "Main Temple"

At this site stood Teocalli of Tenochtitlán, which consisted of twin temples, that symbolized two sacred mountains; the one on the left represented Tonacatepetl, the Hill of Sustenance, whose patron deity was Tlaloc, the ancient god of rain; the one on the right represented the Hill of Coatepec, birthplace of the Aztec war god Huitzilopochtli.

the main temple of the Mexica people in their capital city of Tenochtitlan, which is now Mexico City.

The temple is thought to be on the exact spot where the Aztecs saw their symbolic eagle perching on a cactus with a snake (though some say Spaniards added this serpent image) in its beak – the symbol of Mexico today. In Aztec belief this was, literally, the center of the universe.