Introduction to Dao Dao Palace: It is said to be the place where Huang Emperor Dao Dao met Guangchengzi. It was built in the Northern Song Dynasty and was originally located on the terraces on the north bank of the Jing River at the foot of the mountain. When the Kongtong Reservoir was built, it was moved to the foothills of Xuanhe Cave in Dongtai because it was located in the area where the reservoir water was submerged. There were 1 building with 3 couplets of the Huangdi Dao Hall in the corridor screen style, 1 Hunyuan Pavilion, and 13 kitchen and warehouse buildings with brick and earth-wood structures. During the period, one hole each was dug for the Bodhisattva and Guhun caves.