This document provides information about ancient Aztec and Mayan civilizations. It discusses the Aztec empire, which was centered in modern-day Mexico City. Key sites discussed include Teotihuacan, Tlateloco, and Tenochtitlan. The Mayan civilization is also summarized, noting important ruins at Palenque, Chichen Itza, and Tulum. Chichen Itza is described in more detail, highlighting structures like El Castillo pyramid, the Temple of Warriors, and the ball court. Cenotes, or underwater sinkholes, used for sacrifices are also mentioned.