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June 24, 2011 -- Peruvians have been celebrating all month Machu Picchu's 100th anniversary of the discovery of the archaeological wonder.
This 15th-century Inca city of carved stone structures, built on an Andean mountain range, was introduced to the world by American explorer Hiram Bingham.
Historians and archeologists still don't agree on Machu Picchu's function. Some believe the site was a sacred location while others say it was a resort town for an Inca emperor. Up to 1,000 people are believed to have lived at the site.
The site, surrounded by tropical forests, was declared a UNESCO World Heritage Site in 1983.