Machu Picchu is situated around 50 miles northwest of Cuzco, Peru, in the Cordillera de Vilcabamba of the Andes Mountains. It is located over the Urubamba River valley in a narrow saddle between two sharp pinnacles - Machu Picchu ("Old Peak") and Huayna Picchu ("New Peak") - at a height of 7,710 feet.
Machu Picchu's presence was not generally known in the West until it was "found" in 1911 by the Yale University professor Hiram Bingham, who was directed to the site by Melchor Arteaga, a nearby Quechua-talking occupant. Machu Picchu was additionally excavated in 1915 by Bingham, in 1934 by the Peruvian excavator Luis E. Valcarcel, and in 1940-41 by Paul Fejos. One of the few pre-Columbian remain, Machu Picchu was assigned an UNESCO World Heritage site in 1983.
Here is an informative presentation on Machu Picchu.