Introduction to Wailongtan: According to legend, Sima Rui ascended the throne during the Eastern Jin Dynasty and made Nanjing (Jiankang) the capital. There is a lotus platform here, where good men and women are competing to ascend to the immortal. General Cao Heng, the general on the right, recognized that it was formed by the mouth of a thousand-year-old snake spirit, so he fought with it and left the ancient monuments Outer Dragon Pond and Inner Dragon Pond. Later, there were monks there. This is where you build a hall to practice alchemy and practice Taoism.