Introduction to Yuquan Cave: Yuquan Cave is the natural portal of Fangguang Rock. The two stones are dependent on each other, with the top closed and the bottom open. The left is engraved with "Tianguan" and the right is engraved with "Tongmen" (commonly known as Tianmen), which has a unique momentum. There are wisps of mist inside the cave, and the mountain breeze blows through it, and a cool feeling hits the face, making people feel tired. Legend has it in ancient times that this heavenly gate was originally movable and could be opened during the day and closed at night to prevent thieves from entering the temple. One year, Emperor Zhengde of the Ming Dynasty stayed overnight in Fangguang. When he got up the next morning, the door was closed, so the emperor wrote "Lie high", and Shimen lay down ever since.