Introduction to Tongtian Cave: It is said that in ancient times, there was an old immortal practicing here in the cave. One day, he achieved great results and knew that it was time to ascend to heaven. Purple clouds formed on his feet, and he smashed the top of the cave and flew away. From then on, the cave had a Tongtian mouth, and people called it Tongtian Cave. Therefore, there are often poems about the cave: "Tongtian Cave, the cave reaches the sky, there are gods in the Tongtian Cave, mortals want to see the gods, they need to do a total of three thousand good deeds."