Introduction to Sanyuan Bridge: The earliest bridge in the ancient town is "Sanyuan Bridge", which was built in 1761 and is also known as Zhang Xiaoniang Bridge. The bridge is a single-hole stone bridge, 19.45 meters long, 3.1 meters wide and 3.2 meters high. There are stone lions on the railings. The whole bridge looks like a crescent moon lying on the Longxi River.