Introduction to Sanyuan: On the ancient Shinto from Wulong Palace to Nanyan Palace, there were three Taoist buildings of Shangyuan, Zhongyuan and Xiayuan built in the Yuan and Ming Dynasties, but they are now abandoned. In the Zhongyuan architectural ruins in Wudang Mountain, there is a unique statue - the Black Tiger Marshal; at the Shangyuan architectural ruins, there are two exquisitely carved dragon head stones on the left and right.