Machu Picchu

Machu picchu was a recluded Inca citadel resting on the ridge of towering Andean peaks flanking the Urubamba river. Over 200 buildings house the sacred city, 1,200 residences in addition to providing them with worship, storage facilities and vast tracts of land terraced for farming. The walls were carved to fit the stones for further construction. It's remote location saved it from being sacked and pillaged. I 1912 it was discovered by Hiram Bingham a Yale archaeologist. Machu Piccchu was built of granite blocks cut with bronze or stone tools and smoothed with sand. The mortar less blocks rest solidly together with a tightness impenetrable to even the blade of a knife. The terraces used to sustain man and beast were made by transporting rich soil from the river banks. They had a highly sophisticated irrigation system and experimented with a variety of crops.

There can be 3 thousand people a day in prime time wondering around Machu Picchu One of the great wonders of the world.