Structures at Machu Picchu were built with a technique called &ldquo ashlar.” Stones are cut to fit together without mortar. Remarkably, not even a piece of paper can fit in between two stones.

The site is made up of precincts, plazas, temples, tombs, rooms for storing food, stone canals and stairways and platforms, distributed on the topography of the mountain in a unique layout of urban design.

Many stones used to build it weighed more than 50 stones, yet no wheel were used to transport heavy rocks.

It is considered by many to be the most spectacular urban creation of the Inca Empire and one of the most important heritage sites in the world. It sits on top of a mountain, 8,000 feet in the tropical forest