Tambomachay is an Incan archaeological site at an altitude of 3750 metres near the city of Cusco, Peru. At Tambomachay, aqueducts created centuries ago by the Incas continue to provide a constant flow of clean water.
I took these photos while visiting Tambomachay on May 19, 2007.
Pukapukara, an Incan fortress near Tambomachay: