Inkallaqta

Inkallaqta is a monumental Inca site in central Bolivia. It is located in the Cochabamba Department, Carrasco Province, Pocona Municipality, approximately 130 kilometers east of Cochabamba. It was most recently excavated by Larry Coben. He believes that the site was used to perform rites for the ceremonial calendar. The site has several important structures such as the Kallanka. It was the largest single roofed room in the western hemisphere when it was built, and measures 78 by 25 meters. There's also an ushnu or a ritual platform on the site. The Torreon of Inkallaqta is also located on this site. Positioned on the western side of the site this six sided structure supposedly had calendrical or astronomical significance. There is a zigzag wall immediately north of the site which is meant to mark and protect it.

Source: Wikipedia