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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, having departed the town of Cachora, heading to Choquequirao, the expedition crossing the pedestrian suspension bridge over the Apurimac river. Piotr Redlinski for The New York Times.