Introduction to the first bridge: There are 5 ancient stone bridges built since the Tang and Song Dynasties on the north and south streams of Sanxi Village, namely the big bridge, the flat bridge, the first bridge, the dragon bridge and the lower bridge. The first bridge was built in the Song Dynasty and is located at the head of the three streams, hence its name. The stone structure bridge is 3.2 meters high, 8.3 meters long, 1.75 meters wide, the beam stone is 0.4 meters thick, and the bridge stone is 9 meters long.