Introduction to Sanyuan Cave: Sanyuan Cave is a natural wonder. There are several quiet and elegant cave dwellings here, in which the three elements of the Heavenly Palace, the Earthly Palace, and the Water Palace (the Jade Emperor, the Earth God, and the Dayu) respected by Taoism are enshrined. The most peculiar thing is that the cave dwelling is so deep that the wind blows day and night. The spring and summer wind blows outward, and the autumn and winter wind blows inward, so it is called Sanyuan Cave.