MACHU PICCHU: One hundred years ago on July 24, Yale lecturer Hiram Bingham was led by locals to the ruins of Machu Picchu , a mountain retreat created by the Inca Empire in the middle of the 15th century. Image: LARRY GREENEMEIER
Supplemental Material
http://www.scientificamerican.com/article.cfm?id=machu-picchu-bingham-centennial
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