Lugou Bridge is one of the famous scenic spots in Beijing and the oldest existing stone arch bridge in Beijing. The whole bridge is a stone structure, and the key parts are also connected with silver ingots and tenons. It is the longest ancient stone bridge in northern China. There are eleven combined arches with a total length of 266.5 meters. Stone lions with different shapes are carved on the stone guardrails on both sides. 1On July 7, 937, Japan launched a war of aggression against China from here.