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Peru

This huge series of concentric terraces in Moray (just west of the salt pans of Maras) served as an ancient agricultural research station. The distance from the highest to lowest ring is 150 m (490 ft), which allowed the Wari and later the Inca peoples to experiment with growing crops at different altitudes and exposure to the sun. The circular bottom is so well drained that it never completely floods, no matter how hard the rain.