Introduction to Tianxin Cave: There is a special cave in the cave. There is a small hole at the top of the cave. It is mainly formed due to rain falling on the limestone of the mountain. The limestone has the characteristics of being soluble in water. After long-term erosion, this hole was formed. Strange landscape. It is said that one can peer into the "heart" of heaven from here. If a treacherous and unfilial person looks into the heart of heaven, the world will spin and he will fall unconscious. If the wishing stone can be thrown into the hole, all wishes will come true.