Pisac is a Peruvian village in the Sacred Valley on the Urubamba River. The village is well known for its market every Sunday, Tuesday, and Thursday, an event which attracts heavy tourist traffic from nearby Cusco.The area is perhaps best known for its Incan ruins, known as Inca Písac, which lie atop a hill at the entrance to the valley.Intihuatana includes a number of bathes and temples. The Temple of the Sun, a volcanic outcrop carved into a "hitching post" for the Sun , is the focus, and the angles of its base suggest that it served some astronomical function. Q allaqasa, which is built onto a natural spur and overlooks the valley, is known as the citadel.The hillside is lined with agricultural terraces constructed by the Inca and still in use today. These terraces were created by hauling richer topsoil from the lower lands by hand. They enabled them to produce surplus food more than would normally be possible at altitudes as high as 11,000 feet.