Braničevo Fortress
Serbia
Braničevo Fortress is an archaeological site of medieval fortress whose remains are situated in the village of Kostolac, in Serbia, about 130km East of Belgrade and 24 km from North East of Požarevac. It consists of two medieval fortified structures located in Mali Grad and Veliki Grad, on the right bank of the Danube and above Dunavac and the Mlava River.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).