Elfsborg Fortress
Gothenburg Municipality, Sweden
Älvsborg Fortress (Swedish: Älvsborgs fästning), with its main facility Oscar II's Fort (Swedish: Oscar II:s fort) built 1899–1907, is a now-defunct Swedish fortification located at the mouth of the Göta River in the Älvsborg district of Gothenburg, Sweden.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).