Marco Polo Bridge (Lugou Bridge), also for the Marco Polo Bridge, about 15 kilometers Southwest in Beijing Fengtai District, Yongding River. Across the Lu Gou, namely, the Yongding River, named Beijing the oldest of the stone arch bridge. Marco Polo Bridge, 266.5 m in length, 7.5 meters wide and up to 9.3 meters at its widest point. Piers 10, 11 bridge opening, the whole bridge is the stone structure, key parts are silver ingots of iron tenon connection, the ancient stone bridge in North China's longest. July 7, 1937, the Japanese imperialists in the Aggression War against China. Wanping City Chinese garrison to resist, known as the Marco Polo Bridge Incident (also known as the Marco Polo Bridge Incident). Chinese anti-Japanese forces in the Marco Polo Bridge fired the first shot of the total resistance.