Speaking at a 1913 National Geographic Society gala, Hiram Bingham III, the American explorer celebrated for finding the "lost city" of the Andes two years earlier, suggested that Machu Picchu "is an awful name, but it is well worth remembering." Millions of travelers have since followed Bingham's advice. When Bingham first encountered Machu Picchu, the site was an obscure ruin. Now designated a UNESCO World Heritage Site, Machu Picchu is the focus...