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In 1911, American historian Hiram Bingham publicized the finding of what at the time was considered a “lost city” of the Inca. Though local inhabitants had known about it for century, Bingham documented and photographed the ruins of a 15th century settlement nestled along a mountain ridge above the Urubamba Valley in Peru, placed so perfectly from a defensive standpoint that it’s believed the Spanish never conquered it and may have never known about it.