The Amazon is the largest tropical rain forest on the planet that until the twentieth century seemed untouched by man. But today, science is pealing back the canopy to reveal an untold history, one in which great swathes of the dense jungle were once gardens or farms, successfully managed by a huge and organized civilization. This new evidence suggests that legends of lost cities, like the mythical El Dorado, might be based in truth. In 1542 conquistador Francesco de Orellana was searching for the mythical City of Gold, El Dorado, but got hopelessly lost. A diary kept of his epic adventure tells of a sophisticated population living in a network of gleaming white cities. But the diary was dismissed as a hoax. This film reconstructs his epic journey to discover the truth. Today archaeologist Eduardo Neves has found more than a hundred ancient sites around in central Amazon. Fertile man-made soil, more than a thousand years old, has been found all across the rain forest. The soil ...