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May 21-June 6th, 2011. Peru, on a 100 year anniversary of Machu Picchu's first publication in the National Geographic, a 10 day expedition sets out to trace the explorer Hiram Bingham's path to Inca's most sacred city. Here, mules and horses in the the valley near the town of Huancacalle just pass the 4615m Choquetecarpo pass on the trail from Yanama to Vitcos. Piotr Redlinski for The New York Times.