Feng Menglong
Taiji Cave () is a karst cave located on Shilong Mountain () in Guangde County, Xuancheng City, Anhui Province, People's Republic of China, where the provinces of Jiangsu, Zhejiang and Anhui meet. Ming Dynasty writer and poet Feng Menglong described the cave as one of the "Four Absolutes Under Heaven" (天下四绝 "Tīanxià Sìjué"). It is also considered a primary "Place of Enlightenment" (道教道场 "Dàojiào Dàochǎng") by Taoists, similar to the Bodhimanda of Buddhism. The 200-million-year-old cave is divided into dry and wet layers representing the yin and yang of Chinese philosophy.