Wed Jun 18, 5:10 PM ET
Porters walk along a path during an Inca trail expedition in Cuzco, Peru, Friday, April 11, 2008. Porters on this famed Andean adventure trek to the jungle shrouded ruins of Machu Picchu channel the fleet-footed chasqui Inca messengers who darted through the vast road network of South America's most powerful empire. (AP Photo/Andrew Whalem)
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