Introduction to Jiulian Cave: The natural cave behind the Holy Mother Palace. Inside the cave is the statue of Sun Simiao, the King of Medicine, and outside the cave is the Nine Lotus Holy Mother. The cave is 7 meters high, and water has been dripping inside it for many years, forming a 2-meter deep pool. The water is rich in minerals and is also called holy water. There are also various geological wonders such as stalactites and stalagmites in the cave.