34 years ago today, on October 24, 1991 (September 17, 1991 lunar calendar), Zhaozhou Bridge was named an International Civil Engineering Milestone. Zhaozhou Bridge In late October 1991, Zhaozhou Bridge, located in Zhao County, Hebei Province, our country, was recently selected as the oldest "International Historic Civil Engineering Milestone" by the American Society of Civil Engineers. The American Society of Civil Engineers has extremely strict criteria for the selection of "International Historic Civil Engineering Milestones", and requires that it must be the most brilliant example of civil engineering in the history of the world. Zhaozhou Bridge is the 12th "International Historic Civil Engineering Milestone" selected by the American Society of Civil Engineers. Previously selected are: London Bridge in the United Kingdom, Paris Eiffel Tower in France, Panama Canal, Sydney Bay Bridge in Australia, etc.