Teotihuacan became a new religious center in the Mexican Highland, around the time of Christ. Archaeological data show that Tzacualli to Miccaotli phases; A.D. 1-200 were characterized by monumental construction, during which Teotihuacan quickly became the largest and most populous urban center in the New World. By the fourth century unmistakable influences of Teotihuacan were felt throughout most parts of Mesoamerica. It was the sixth largest city in the world during its period of greatest prosperity, according to an estimated population of 125,000.
Avenue of the Dead was the main street of Teotihuacan. It was more than 2.5 km, beginning at the Moon Plaza to the north and extending beyond the Ciudadela and the Great Compound complexes to the south. This main street divided the city into two sections.
The main part of the avenue was the section between the Moon Pyramid and the Rio San Juan channel. It was lined with long talud-tablero platforms.
The Sun Pyramid was excavated by Leopordo Batres. Since then, two tunnels have been excavated into the core of the pyramid, providing more information about its chronology and substructure.
The Sun Pyramid was approximately 215 by 215 m at the base, and about 63 m high. The importance of the pyramid is indicated by a cave located under the structure that was used for ritual activities, and why the pyramid was constructed where it is today.
Located at the extreme northern end of the Avenue of the Dead, the Pyramid of the Moon is the principal axis of the city of Teotihuacan.
The Aztecs considered Teotihuacan a sacred site even though it had been abandoned long before their time. The Aztecs gave the name to the site Teotihuacan and it means "city of the gods" or "where men become gods." Nobody knows the ethnic group or the language spoken by the inhabitants of Teotihuacan, so they are called "Teotihuacanos".
The archaeological site has five entrances. If you want to do a full tour of the site, enter at entrance 1 at the south end of the site. Walk the length of the Avenue of the Dead (about one and a quarter miles or 2km). If you take a shortened tour, many tour groups begin at entrance 2, level with the Pyramid of the Sun. It is a better option if your time is limited or you don't want to walk much.