Introduction to Panlong Valley: The Yellow River Stone Forest is full of peaks, all connected to each other. There is a valley in the peak forest, named Panlong Valley, and there is a fairy cave in the valley called: "Panlong Cave". There is a naturally formed Tai Chi diagram on the top of the cave, with dragons and phoenixes in the picture. Panlong Cave is 16 meters deep, 13 meters wide, 3-4 meters high, and the highest point reaches 8 meters. The constant temperature in the cave is around 17° all year round. There is a temple "Xinglong Temple" in the cave. It has been a religious holy place for nearby people for generations. It houses statues of gods and shrines. It has been worshiped by incense from all directions for hundreds of years, and its spiritual energy is revealed. Every early spring and early autumn, mist drifts out from the entrance of the cave. Like the immortal energy in Longkou, it is very magical. In fact, due to the large temperature difference between the inside and outside of the cave, fog naturally forms when the external humidity increases.