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Constantine's Bridge (Romanian: Podul lui Constantin cel Mare; Bulgarian: Константинов мост, Konstantinov most) was a Roman bridge over the Danube. It was completed or rebuilt in 328 and remained in use for no more than four decades. It was officially opened on July 5th, 328 in the presence of the emperor Constantine the Great. With an overall length of 2437 m, 1137 m of which spanned the Danube's riverbed, Constantine's Bridge is considered the longest ancient river bridge and one of the longest of all time. https://en.wikipedia.org/wiki/Constantine's_Bridge_(Danube)