Introduction to Marco Polo Bridge: Marco Polo Bridge, also known as Lugou Bridge, spans the Yongding River in Fengtai District, about 15 kilometers southwest of Beijing. The bridge is 266.5 meters long, 7.5 meters wide, and 9.3 meters wide at its widest point. There are ten bridge piers and a total of 11 bridge holes. It is the longest and oldest stone bridge in North China.