Built in the fifteenth century and tucked away in the mountains of Peru, Machu Picchu was abandoned after the Spaniards conquered the Incan empire in the sixteenth century. It remained hidden until 1911 when Hiram Bingham uncovered the marvelous complex and shared his discovery with the world. Today, hundreds of thousands of people visit the site to climb the 3,000 stone steps, explore the towering monuments, and see the numerous species that call these famous ruins home.

Where is Machu Picchu? -- Who were the Incas? -- Palaces and more palaces -- The palace at Machu Picchu -- Life in the clouds -- Invaders! -- Who was Hiram Bingham III? -- The discovery -- Mistakes -- Visit to a lost city -- Timelines.