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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, passed the town of Cachora, heading to Choquequirao, fields of wild grasses alongside Apurimac river valley. Piotr Redlinski for The New York Times.