Introduction to Jiuyan Mountain: The majestic and majestic Jiuyan Mountain is located in the southeast of Tiantai Mountain. The mountain has lush forests, thick bushes, cliffs, strange rocks and peaks, and thousands of years of ancient military forts are scattered all over the mountains and fields. The story of "Xue Gang's rebellion against the Tang Dynasty" is here The local legend has been around for a long time, and the ancient military fortresses, ancient city walls, and ancient battlefield relics on the mountain are well protected, making it an ideal place for historical research and ancient exploration. There is a stone cave on the east cliff of Jiuyan Mountain, called Zhizhidong. It is said that it was a fairy cave where ancient monks and Taoist priests practiced in seclusion.