Located on the east bank of the Tuwei River in the southwestern sea of Shenmu County, Gaojiapu Ancient City was originally a city built with rammed earth walls. It was later built over with bricks in 1608, and has been repaired many times in later years. The Ancient City has one of the most relatively complete castles in Shenmu County and even in all of northern Shaanxi, with unique conservation value. Gaojiapu Ancient City has a rectangular shape. Visitors can walk a circular route along the city wall and observe the large remaining sections of the wall, which contain crenels, lookout caves, and other defense systems. There is a rolling door with a barbican in each of the east, south and west walls of the castle. These buildings, left over from the Ming Dynasty, have stood here for five or six hundred years.