Teotihuacan, Mexico: The Pyramid of the Sun
Not much is known about the people who inhabited the central Mexican city of Teotihuacan in the first few centuries A.D., but they clearly had architectural skills. Their well-planned city covered more than seven square miles and included several pyramids, the most impressive of which is the Pyramid of the Sun. The sides of its square base are about 730 feet wide, and its five stepped layers once rose to a height of over 200 feet. It is situated beside the city’s central road, the Avenue of the Dead, which runs south from the Pyramid of the Moon to a large temple complex.