Beyond the Basilica is the turnoff to the pyramids of Teotihuacan, 31 miles Northeast of Mexico City. The site is one of Mexico's most popular tourist attractions and its first true city. The pyramids of the Sun and Moon, the Ciudadela, or Citadel, with its Temple of Quetzalcoatl (the Plumed Serpent) and the Palace of Quetzalpapalotl (Plumed Butterfly) are the major constructions along the site's nearly mile-long Avenue of the Dead.

The Pyramid of the Sun is the largest, standing 210 feet high. The Teotihuacan monuments were built as flat-topped bases for ceremonial temples reaching high into the sky, to be near the gods.

Archaeologists have discovered a tomb and offerings under the Pyramid of the Moon at the Teotihuacan ruins north of Mexico City. Researchers hope this outstanding find, which includes jade and obsidian figurines, will shed light on the mysterious civilisation that flourished here between 150 and 450 AD, especially its government and ruling class. In this latest phase of explorations, which have continued non-stop since the late 1920s, researchers were tunneling beneath the pyramid to study its building patterns. More discoveries are expected.