Dęblin Fortress
Dęblin, Poland · built 1845
Dęblin Fortress (Twierdza Dęblin, originally Ivangorod Fortress) refers to the 19th century fortifications in the town of Dęblin, Poland. Part of the fortress is used as a museum and the area is owned by the Polish military.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).