Teotihuacan is an ancient Mesoamerican city located in a sub-valley of the Valley of Mexico, 25 miles northeast of Mexico City. It is the most visited archeological site in Mexico, and the site of many of the most architecturally significant Mesoamerican pyramids built in the pre-Columbian Americas, namely the Pyramid of the Sun and the Pyramid of the Moon. At its zenith in the first half of the first millennium, Teotihuacan was the largest city in the Americas, considered as the first advanced civilization on the North American continent, with a population estimated at 125,000 or more, making it at least the sixth-largest city in the world during its epoch. The city is thought to have been established around 100 BCE and to have lasted until sometime between the 7th and 8th centuries CE, but after
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