The main magnet of Xian is the city wall, which is the most complete city wall that has survived in China as well being one of the largest ancient military defensive systems in the world. It was enlarged in Ming Dynasty (1368-1644) from the city wall initially built in Tang Dynasty (618 -907). Now it is 12 meters tall, 12-14 meters wide overing 14 kilometers in length with a deep moat surrounding it. You can walk, even cycle on the wall. Its south gate is the most largest with a suspension bridge. Most of the tourists choose the south gate for sightseeing.
The City Wall has corner towers, ramparts, sentry towers, gate towers, battlements and a a number of city defensive fortifications with very strong defense capability. The inner city was once the living place of the King of Qin. It was constructed on the high land in the northeastern area of the city. There the whole city were under control by its advantage of high position. Two continuous walls and a protective moat surrounded the residence. The principal part of the architectural complex was constructed in the light of the traditional pattern of "Palace in the front and bedchamber at the back". There is a suspense bridge in front of the gate. Raising the bridge means, the way to enter the city or go out are cut out. In the Ming Dynasty the fort had become an grand and precise defense system and now is still a better ancient fort kept intact than any other.
After consistent repair and protection, the Xian City Wall now offers a good combination of the city wall, city moats, forest belt and city ring-routes. In early years, those ancient walls regarded as the obstacle to the modernization of the city, but now it is the pride, which offers great honor to the old city.