Sillustani is located on the shore of Lake Umayo, near Puno. The tall red towers are Incan tombs. There is also the remnants of a temple at the base of the hill. The foundation of the temple correlates with the solstices and equinoxes. While building the towers, they built ramps to bring the rocks to the next level, and then knocked the ramps down once the tower was complete. The stones are large, and it is impressive that they were able to shape it so accurately that the stones are flush to one another and some of the towers are still standing today.