Colca Canyon is reportedly the deepest in the world, thought to be twice as deep as the Grand Canyon in the USA. Unlike most of the Grand Canyon, portions of the Colca canyon are habitable, with pre-Colombian terraced fields still supporting agriculture and human life.
In the 1980's, with the Majes Hydroelectric Project, roads opened the Colca to the outside. One of the attractions to visitors is a glimpse into a way of life that has endured in isolation for centuries.