The Norwegian Defence Estates Agency manages 14 national fortifications all over Norway. They welcome a total of 2.5 million visitors a year.
Oscarsborg fortress is situated on the Oslofjord and has had the important function of defending the seaward approach to the capital. With its strategic location on an island, Oscarsborg Fortress is a very popular tourist destination, with its own marina and great biological diversity. The fortress area is open all year.
Oscarsborg is only accessible by boat. A ferry service runs every day all year from Drøbak to Oscarsborg Fortress. The crossing from Drøbak takes about 10 minutes. If the weather is good, we recommend sitting on the sun deck. Check the ferry timetable in advance since summer and winter schedules differ.