Introduction to Jimen Bridge: It was built in the Ming Dynasty. During the Qianlong period, the Forbidden City diverted the river water here, and the original bridge was rebuilt into a shape like a jade belt, so it is also called the "Jade Belt Bridge". The bridge is eight meters wide and consists of seven single-hole stone bridges with white marble guardrails on both sides and dragon and phoenix pillars arranged alternately. The middle one is the Royal Road Bridge for the emperor to walk on, the two sides are the Wanggong Bridge, the second is the Pingguan Bridge, and the two side bridges are for ordinary people to walk. It reflects the hierarchy of feudal society.