15th-century Inca citadel, located on a 2,430-metre (7,970 ft) mountain ridge. Machu Picchu was built in the classical Inca style, with polished dry-stone walls. It is the most familiar icon of the Inca civilization. The Incas built the estate around 1450 but abandoned it a century later at the time of the Spanish conquest. Although known locally, it was not known to the Spanish during the colonial period and remained unknown to the outside world until American historian Hiram Bingham brought it

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