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14 once-great lost cities

By: Bryan Nelson on May 21, 2014, 3:53 p.m.
Machu Picchu

Photo: Martin St-Amant/Wikimedia Commons

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Machu Picchu

Completely unknown to the outside world until it was discovered by the American historian Hiram Bingham in 1911, Machu Picchu is today perhaps the most famous icon of the once-great Inca civilization. The city is so well hidden high on its Andean perch that the Spanish Conquest never encountered it. For this reason, it's invaluable as a relatively intact cultural site.