If you want to stay local and not travel the 50 minutes out of town to visit the Maya ruins of Teotihuacan, consider visiting the Templo Mayor archeological site and museum in Centro Histórico. The historic downtown area of Mexico City was the ancient Aztec capital of Tenochtitlan, and the excavation of Templo Mayor in 1978 revealed a pyramid structure with two shrines for the god of war and god of rain and agriculture. It was one of the main Aztec temples.