Introduction to Guguancheng: Guguancheng is more than 10 kilometers south of Badaling, that is, Juyongguan. It is located north of the south entrance of Changping County, the northern suburbs of Beijing, and about 50 kilometers away from the urban area of Beijing. It is one of the eight major passes in the Taihang Mountains and borders Jundu Mountain, a branch of the Yanshan Mountains, to the east. It is made of white marble and looks like clouds from a distance, so later generations called it Yuntai. The top of the platform is 25.8 meters long and 12.9 meters wide. There are main hall pillars on it, white marble flame column rails around the base, and a carved stone dragon platform under the railings for drainage and installation. There are reliefs of Tongguo riding beasts, golden-winged birds, dragons, whales, elephants and other reliefs at the entrance of the platform. The door is filled with exquisite reliefs of Thousand Buddhas, Heavenly Kings, etc., as well as precious Sanskrit, Mongolian, Uyghur, Han, Xixia and other reliefs. Waiting for 6 verses.