Introduction to the Sun and Moon Gate: The Sun and Moon Gate is one of the four city gates in the ancient town. It echoes the Hengsheng Gate and takes the meaning of "the sun rises and the moon stays", which means that anyone who passes through this gate will have strong financial luck and prosperous official career. Riyuemen is also the only way to Laixi River. After passing Riyuemen, you can come to Darong Bridge.