 The restored and rebuilt Shuri Castle, the former royal palace of the Ryūkyū Kingdom, is one of the finest "gusuku" (Okinawan castle) and among the most important historical sites in Naha.The palace, and a series of tunnels underneath it, were used as a major command post by the Imperial Japanese military during World War II, and the castle was subsequently almost destroyed in 1945 by the US Marines, Army and Navy.After the war, the University of the Ryūkyūs was constructed on the site.