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On July 24, 1911, American archeologist Hiram Bingham gets his first look at Machu Picchu, an ancient Inca settlement in Peru that is now one of the world's top tourist destinations. Tucked away in the rocky countryside northwest of Cuzco, Machu Picchu is believed to have been a summer retreat for Inca leaders, whose civilization was virtually wiped out by Spanish invaders in the 16th century. For hundreds of years afterwards, its existence was a secret known only to the peasants living in the region. That all changed in the summer of 1911, when Bingham arrived with a small team of explorers to search for the famous "lost" cities of the Incas.