Introduction to Heishantou Ancient City: Heishantou Ancient City is a ruins of the Liao Dynasty, located about 10 kilometers northwest of Heishantou. The ancient city consists of two parts: the inner city and the outer city. The city walls are all made of earth. The outer city is square, with moats and urns outside the walls; the inner city is rectangular, with glazed tiles and various ceramic fragments everywhere. The once glorious grassland city site is now an abandoned site, which makes people sigh.