Zhangbi Ancient Castle.

Zhangbi Ancient Castle was likely formed during the Northern Dynasties and Sixteen Kingdoms period, and has gone through three stages: fort, military town, and defensive village. It gradually formed a five-level military defense system with "above-ground castle, underground tunnel" as the main structure. It is known as the "above-ground and underground twin city, castle courtyard temple wall museum village", and is one of the important fortresses of the ancient military fortress Que Shu Valley. The tunnels are complex and although many areas are not open, if you do not follow the instructions after entering, you may still get lost. The wardrobe is connected to the tunnel. The current open area is about 10%, about one kilometer. The peacock blue Ming Dynasty glazed stele in the village is also a rare cultural relic.