TEOTIHUACAN, MEXICO - FEBRUARY 07: View of the Pyramid of the Sun and the Avenue of the Dead from the top of the Pyramid of the Moon on February 07, 2009 in Teotihuacan, Mexico. The ancient pre-hispanic site of Teotihuacan, 50 km North of Mexico City, was once the biggest settlement in this part of the world and its civilization had a significant influence throughout Mesoamerica. (Photo by Nina Raingold/Getty Images)
