Introduction to the Wengcheng Entrance: The Wengcheng Entrance is a natural stone cave. The cave is wide in front and narrow in the back, shaped like a tile, so it is called the Wengcheng Entrance. Passing through the cave, there is a natural stone wall called Chengdieyan. , and the entrance of the urn city complement each other, forming a natural urn city like an ancient city.