According to legend, Taoism has thirty-six caves, and seventy-two blessed places are places where immortals live and rest. Heaven is a part of Taoist wonderland. "Cave Heaven" refers to a "cave" where mountains surround the ethereal, Yin and Yang reach the sky, immortals participate, immortals live, and ordinary monks practice and can ascend to immortality. The blessed land, called "blessed land", is dominated by earthly immortals and real people. If you live here, you can be blessed and become immortal. The world thinks that the land of heaven is auspicious and full of admiration. Taoist hermits like to live in quiet forests, so they choose places with fairy tales to build temples, which can benefit from the fairy wind and Taoist temple. Since ancient times, Taoist couples have stopped living and pilgrims have been in an endless stream. Therefore, this cave has become a scenic spot of Chinese embroidery rivers and mountains.
Sima Chengzhen, a Taoist priest in the Tang Dynasty, wrote in the Map of Heaven and Earth Palace that there are 72 blessed places on earth. The Taoist classic "Cloud Seven Signs" has a cloud in its cave (Volume 27): "The third blessed place, Qixian Mountain (the third blessed place in the world), is near Baixi Caoshi, Shili, Liangcheng County, Wenzhou, and is governed by a real person Zhang Huadong." Many scholars of literature and history have made authoritative textual research on ancient books, such as Yun Qi's Four Wonders, Tiangong Collection of the Great Song Dynasty, Records of Famous Mountains in Du Yue, Records of Yueqing County in Yongle, Records of Bailong Mountain and so on. Bailongshan in Dongxiang Hongqiao, Yueqing City is the third blessed place in the lost world.