Teotihuacán, an hour outside Mexico City, was one of the largest ancient cities in the pre-Hispanic Americas, with a population, at one point, of over 150,000 people. Most likely, the site was built in the first century CE and eventually included different indigenous groups who migrated here.
The Pyramids of the Moon and Sun and other elite palaces and apartments rise from the high altitude plateau with the long Avenue of the Dead the main boulevard.
By 650 CE the city was deserted perhaps due to drought, famine, ethnic division, and ultimately revolution. Did geographic forces like a volcano or earthquake precipitate changes? Many mysteries remain.
