ALISON WRIGHT / SCIENCE PHOTO LIBRARY ALISON WRIGHT / SCIENCE PHOTO LIBRARY
View of Teotihuacan, an enormous pre-Columbian archaeological site near Mexico City, Mexico. The city was established around 100 BC inhabited until the 600 or 700 AD. At its zenith it would have been among the largest cities in the world for its time period, with over 200,000 inhabitants.
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