Pyramid of the Sun

Photo: The Pyramid of the Sun at Teotihuacan, Mexico
Mexico's Teotihuacan complex and most of its buildings, including the Pyramid of the Sun (shown here), were named by the Aztec, who discovered the site hundreds of years after it was abandoned. Despite more than a hundred years of study, scientists still know very little about the ancient city, including its original name.
Photograph by Martin Gray

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