The ancient structure that served as a ceremonial center for the Aztec civilization was the Templo Mayor located in Tenochtitlan, present-day Mexico City. This important religious site was dedicated to the gods Huitzilopochtli and Tlaloc and played a central role in Aztec culture. The Templo Mayor was the site of numerous rituals, including human sacrifices, which were believed to appease the gods and ensure the prosperity of the empire. Its architectural significance and cultural importance highlight the advanced society of the Aztecs.