🌐EnglishEnglishDeutschFrançaisNederlandsPolskiPortuguêsSvenskaالعربية中文日本語EntityQ2033069· pop 16· linked from 113 articlesOscarsborg Fortresscoastal fortress in the Oslofjord, NorwayConnectionsRoyal Norwegian NavyEntityFredrikstenEntityCategories1848 establishments in Norway2002 disestablishments in NorwayForts in NorwayFrognMilitary and war museums in NorwayMilitary history of Norway during World War IIMilitary installations closed in 2002Military installations established in 1848Military installations in AkershusMuseums in AkershusProtected areas of NorwayWorld War II sites in Norway