Called the Inca’s Bath, Tambomachay (7 a.m.–6 p.m. daily) lies about 300 meters off the Pisac road, though it is well marked with a sign. It is a well-preserved example of the sacred water fountains found at nearly every important Inca temple, including Pisac [1], Ollantaytambo [2], and Machu Picchu [3].
The Inca took a natural spring and painstakingly channeled the water through three waterfalls, which continue to work perfectly today. There is a fine Inca wall above with ceremonial niches.
The Inca worshiped water as a vital life element, and this site no doubt formed part of a water cult. From here, you can see Puca Pucara [4], on the other side of the road.
Links:
[1] http://www.moon.com/destinations/peru/the-sacred-valley/pisac
[2] http://www.moon.com/destinations/peru/the-sacred-valley/ollantaytambo
[3] http://www.moon.com/destinations/peru/machu-picchu
[4] http://www.moon.com/destinations/peru/cusco/sights/outside-cusco/puca-pucara