Citadel of Machu Picchu (in Quechua voice: old mountain) is the greatest Inca work known for having been built in the greatest topographical difficulty, rustic and inaccessible. It is now universally known, both for its imposing and original ruins, as for its incomparable situation on the edge of an abyss, in whose bottom run the stormy waters of the Urubamba River.

Even today, it is a mystery how they managed to take huge blocks of stone to the top of the mountain and build such a spectacular exponent of their knowledge and culture.