Symbolizing strength, trust, courage and wisdom, the entire castle is built on a hill 100 meters high, and the base should be granite, which is extremely hard. Due to the relative altitude, it looks like a sky city falling to the surface from a distance. Walking on the road, there is a bit of the flavor of Pudala. However, the lonely mountain in China was built earlier. The military use of the castle is very obvious. The protective wall is more than 30 meters high, and there are seven gates from the entrance to the top of the mountain. It is an invincible defense in the era of cold weapons.