Machu Picchu — Lost City of the Clouds | Heritage Metal Sign

Built at 2,430 meters, invisible from the valley below, unknown to the Spanish who destroyed the Inca Empire around it. Rediscovered in 1911 when Hiram Bingham was led there by a local farmer who knew exactly where it was. The Inca fitted stones without mortar so precisely a knife blade cannot be inserted between them. The walls have survived five centuries of earthquakes that destroyed the Spanish buildings built around them. The Inca built for mountain conditions. The terraced mountain city, the Temple of the Sun, the interlocking stones — in aluminum.

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