Introduction to Screw Cave: Screw Cave, also known as Monkey King Tour Cave, is about 2.3 kilometers long and 1 kilometer east of the observation tower. There is the Yin River in the cave, which is about 1.6 kilometers long and 0.5-2 meters wide. There are stalactites that are more than 100 million years old, with different shapes and unique features. Especially the small waterfall formed by the water flowing naturally from the rocks is very unique. The natural stone scenes such as the Monkey King, Yixiantian, Phoenix, and Divine Turtle are lifelike and lifelike.