Introduction to Yaochi: Yaochi is an eroded cave, oval in shape, about 1 meter deep. Two groups of intersecting fissures in the rock form vortices under the erosion and abrasion of running water carrying sand and gravel, and over time a cave is formed. Legend has it that the Queen Mother of Tiangong came down to earth to take a bath when she admired the beautiful scenery of Tiantang Village.