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When was Machu Picchu declared a UNESCO World Heritage site?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
The Editors of Encyclopaedia Britannica

Machu Picchu was designated a UNESCO World Heritage site in 1983. It is one of the few major pre-Columbian sites found nearly intact and is described by UNESCO as “probably the most amazing urban creation of the Inca empire at its height.” The World Heritage property comprises more than 32,000 hectares (79,000 acres) and includes the citadel as well as the surrounding terrain.