Gaochen Kingdom was an important gateway on the ancient Silk Road, situated near the Flaming mountains 40 km southwest of Turfan. In the first century, military units of the eastern Han Dynasty doing farm work there established a rampart called Gaochangbi. Later it developed into a political, economic and cultural center along with historical changes. The monk XuanZang (602-664) of the Tang Dynasty preached in the city for the King of Gaochang during his pilgrimage to India for Buddhists scriptures. The ancient city of Gaochang consists of three parts: the outer city, the inner city and the palace city. The city walls are fairly well preserved and some other remains can still be seen.