Ollantaytambo is an Inca archaeological site in southern Perú some 60 kilometers northwest of Cusco. Located at an altitude of 2,792 meters (9,160 feet), Ollantaytambo lies in an area the Inca people once called the Sacred Valley, and this marvel of architecture once served as both a temple and a fortress. Built around 1440 AD by the Inca Emperor Pachacuti, archaeologists believe Ollantaytambo was built upon the ruins of a far older city.
Ollantaytambo is a marvel of engineering and architecture. Precision cut blocks of stone are found at the highest levels of Ollantaytambo, but were brought to the site from quarries located at Kachiqhata, in a ravine across the Urubamba River some 5 kilometers from the town. An elaborate network of roads, ramps, and slides connected them with the main building areas. How the builders cut the stones so precsiely remains a mystery.