The Harsova Fortress is one of the few, on this segment of the Lower Danube, which operates, with small interruptions, for 18 centuries in the same area.
The ancient fortress was most likely built in the second half of the 1st century and rebuilt by Trajan at the beginning of the 2nd century, then by Constantine the Great, then by Justinian. In the 13th century, the settlement was dominated by Genoans, and then included in Wallachia. From the middle of the 15th century it is an ottoman fortress. Remains of the medieval fortress, as well as the towers of the Ottoman facility defending the town are still visible today. The wall of the medieval harbour, as well as remains of the ancient port facilities are still seen on the Danube