Introduction to Yang Badong: Yang Badong, also known as Gaizhu Cave, is a "quotation" from Zhongyandang, and it is also an independent work in itself. When Yandang was still called Baishi Mountain, its name had already been recorded in the Song Dynasty Taoist book "Yunji Qizhu", and it was revered as the "Nineteenth Cave in the World". As a Taoist resort, Yangbadong has a strong atmosphere of myths and fairy tales. The names of the eight caves are: Baoguang, Guanyin, Tuotian, Tuhai, Longgun, Eight Immortals, Hunyuan and Yuchan.