DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Avenue of the Dead at Teotihuacan. These stepped stone structures, including the Pyramid of the Sun in the background, are part of the large Teotihuacan archaeological site and city near Mexico City, Mexico. Teotihuacan's Mesoamerican culture reached its peak in the first half of the first millennium AD, with a population of around 100,000 making it one of the largest cities in the world at the time. The pyramids and avenue are thought to have been used for religious ceremonies, with the avenue including ceremonial platforms once topped with temples. Teotihuacan became a UNESCO World Heritage Site in 1987.
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