Originally named Yongtong Bridge, the Ming Dynasty three-hole stone arch bridge was built in 1446 and spans the Tonghui River. It is a necessary passage from Tongzhou to Beijing Avenue, named for its distance from Tongzhou eight miles. Located at exit B2 of Baliqiao Metro Station and north of Baliqiao Toll Station of Jingtong Expressway. Bali Bridge is not only an ancient bridge with unique shape, but also an ancient battlefield in the late Qing Dynasty. Look point 1: The middle arch of Bali Bridge is very high, but its small archs on both sides are very small. Such a disparity also brings a very unique sense of form to Bali Bridge. The arch of Bali Bridge is unique in Beijing. Tonghui River used to be the main grain transport channel in Beijing. The high arch bridge allows sailing boats to pass through directly, and Bali Bridge has the reputation of "Bali Bridge does not fall off the mast". Viewpoint 2: The stone carvings are beautifully decorated. The stone lions with different shapes and vivid shapes are carved on the guard posts of 32 Han Baiyu guardrail boards. Look at point 3: There is a vivid and massive stone animal on both sides of the East and west, along the north and South shores. Legend has it that the water animal in Zhenshui is a clam with nine children born by dragons. Its image is very strange. It says that the dragon is not a dragon, but a shrimp is not a shrimp. It likes swimming and takes water as its companion. Viewpoint 4: Typical straight arch bridge, the central stone of the bridge deck is the central axis of the bridge deck. Compared with the curved arch bridge, its deck is a very straight road, formerly used for mule and horse carts to transport goods. Even today, it is still the main road for traffic. Look at point 5: The old battlefield. In the ten years of Xianfeng in the Qing Dynasty, 30,000 Qing troops fought a bloody battle with the British and French invaders here. In August 1860, Qing soldiers stationed in the Bali Bridge area bravely killed the enemy and looked to death as if they were going to die. All 30,000 soldiers died in the fierce attack of foreign guns and artillery. At 9:00 a.m. on September 21, 1860, the Bali Bridge was lost and bodies were found everywhere on that day. Looking back on the history of the ancient bridge, we should not forget the national shame and remember the martyrs.