In 19911,Hiram Bingham was exploring in the andes mountains in Peru. Bingham was an American professor form Yale University, who was looking for Inca ruins. One day, he asked a guide to take him to some ruins high in the mountains.When they reached the ruins, the professor was amazed.''It seemed like an unbelievable dream'' he later wrote. ''What could this place be ? '' The place was the forgotten city of Machu Picchu.