Tourists visiting the Teotihuacan pyramids in the temple of the feathered serpent. Teotihuacan is an ancient Mesoamerican city located 30 miles 50 km northeast of modern-day Mexico City. The city, which was designated a UNESCO World Heritage Site in 1987, was settled as early as 400 B.C. and became the most powerful and influential city in the region by 400 A.D.
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