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Machu Picchu, Peru
Machu Picchu stands in the middle of a tropical mountain forest at 2,430 meters above sea level. It's believed that the 200 structures that make up the site served religious, ceremonial, and agricultural purposes, but no one really knows exactly how it was used by the Incas in the 15th to 16th century. It wasn't until 1911 that the complex became known to the world.