Introduction to Longmen Bridge: Longmen Bridge was built in the Song Dynasty. It is a typical integrated structure of bridge and pavilion, about six or seven steps long and only two or three steps wide. The east and west sides of the pavilion bridge are engraved with handwritten inscriptions from the Song Dynasty, and there is the famous Shengong Spring under the bridge. The letters "Danxia Cave Sky" and "Longmen Scenic Spots" were written by people from the Song Dynasty.