Introduction to Xuanyue Gate: Xuanyue Gate is the common name of the "Xuanyue Gate" archway. It is a stone building with three rooms, four pillars and five floors. The door is 12 meters high and 12.8 meters wide. On the forehead of the middle gate are engraved the four characters "Zhishi Xuanyue" written by Emperor Jiajing in a meaningful and vigorous style.