Machu Picchu

Machu Picchu is a city located high in the Andes Mountains in modern Peru. It lies 43 miles northwest of Cuzco at the top of a ridge, hiding it from the Urabamba gorge below. Most of the structures are built of granite blocks cut with bronze or stone tools, and smoothed with sand. The blocks fit together perfectly without mortar, although none of the blocks are the same size and have many faces; some have as many as 30 corners. The joints are so tight that even the thinnest of knife blades