On March 18, 1966, a strong earthquake of 6.8 degrees occurred in Zhao Bridge, China. On March 18, 1966, a strong earthquake of 6.8 degrees occurred in Zhao Bridge, China, and the surrounding areas were destroyed to varying degrees. However, Zhao Bridge, which was very close to the earthquake, was safe, reflecting China's ancient highly developed bridge building technology. Zhao Bridge was the masterpiece of Chinese ancient bridge architecture, and is the oldest preserved bridge in the world today. Zhao Bridge was originally named Zhao Bridge, located on the southern river of Zhao County City, built in 605 AD (the year of Zhao Dynasty), was built by famous craftsmen Spring and Stone Crafts and others. The bridge is