Introduction to Xuanyang Cave: Xuanyang Cave is also called Xuanyang Cave. It is at the foot of Huangniu Mountain, nine kilometers northeast of Shanhaiguan District. There are protruding peaks, towering rocks, ancient trees blocking the sun, and running water. There is a "human stone" on the north of the cave, overlooking the mountains, and a "bell stone" on the south, which looks like it is hanging in the air. The cave is 14 meters high and 13 meters wide. It is 37 meters deep and hollow.