Písac 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.
One of its more notable features is a large pisonay tree which dominates the central plaza. The sanctuary of Huanca, site of a sacred shrine, is also near the village. Pilgrims travel to the shrine every September.
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. The ruins are separated along the ridge into four groups: Pisaqa, Intihuatana, Q'allaqasa, and Kinchiracay. Intihuatana group includes the Temple of the Sun, baths, altars, water fountains, a ceremonial platform, and an intihuatana, a volcanic outcrop carved into a "hitching post for the Sun" (or Inti). The angles of its base suggest that it served to define the changes of the seasons. Q'allaqasa, which is built onto a natural spur and overlooks the valley, is known as the citadel.