“Yale historian Hiram Bingham rediscovered Machu Picchu in 1911, and, backed by the National Geographic Society, returned with large expeditions in 1912 and 1915, each time carting out – with supposed special permission from Peruvian President Augusto B. Leguía – crates filled with archeological finds. But now, Peru is threatening to sue the Ivy League school, claiming the permission was either given illegally or misunderstood.”