Mexico City - Circular Pyramid

The Circular Pyramid, erected between 600 and 400 bc and today 18 m (60 ft) high, has a diameter of 112 m (365 ft), and since the eruption of Xitle has been covered and surrounded by lava. During the difficult process of excavation part of the structure was destroyed, and the restoration is of doubtful authenticity. The pyramid seems originally to have been an artificial earth mound, which was subsequently built over on several occasions. The primitive fortress-like style of the pyramid reflects the very beginnings of pre-Columbian monumental religious architecture.

The pyramid consists of five circular tiers of decreasing size, ending in a platform with the remains of an altar. There were probably two staircases leading up to the