Introduction to Ganlu Cave: Ganlu Cave, also known as "Fairy Cave", is a natural rock cave halfway up the mountain on the north side of Zhagong Valley. Legend has it that it was the place where Master Yutuo Yundan Gongbu, the originator of Tibetan medicine, practiced medicine and received his apprenticeship. There are now murals of the Tibetan medicine master preserved in the cave for the world to admire. This cave is regarded as a "sacred cave" by local people, and the spring water in the cave is "sacred water". Drinking it can cure all diseases and prolong life.