April 9 and Oscarsborg are inextricably linked. Welcome to an exciting historical experience. Photo © Einar Ingvaldsenl

Oscarsborg Fortress: Museum & guided tour

Oscarsborg is one of the most central monuments from World War II in Norway. The lowering of the cruiser Blücher April 9 was one of the few effective countermeasures the Norwegian Armed Forces managed to direct against the German invaders. Today the fortress is "civilized" and has no military functions, but is administered by a military commander. Therefore, the split flag still hoists over the old castle. Oscarsborg Museum is updated and invites the public to the broad historical presentation of the fortress' significance. read more HERE.

  • The Fortress Museum shows the Kaholmen's military history from the first blockhouses in 1640 until today, with emphasis on the events of April 9, 1940.
  • Coastal Artillery Museum shows the Coastal Artillery's structure from 1899 until its closure in 2007.
  • The Fire Management Museum has a unique collection of fire control materials used in the Coastal Artillery. This exhibition is only opened in connection with a booked tour.

Guided tour

Oscarsborg Fortress is one of the region's lighthouses when it comes to tourism. Over 100.000 people visit Oscarsborg every year, and on the beautiful island in Drøbaksundet there are hotels, restaurants, spas, a cozy pier inn, guest harbor, galleries, concerts and opera. All most central is the Fortress Museum, which reopens in May 2017. The island is an eldorado for children, with its own playground and a number of exciting experiences, whether it is big cannons, crab fishing or dark passages and tunnel safaris. We recommend one Guided tour where highly qualified connoisseurs of the fortress will give you this summer's great aha experience. Oscarsborg Museum has eleven authorized guides who convey the history of the fortress throughout the year, both through guided tours and lectures.

Oscarsborg has a lot to tell! We recommend a guided tour.Oscarsborg has a lot to tell! We recommend a guided tour.

Find out more about guided tours this link!

The fortress has over the years been the subject of great efforts by local forces to perform maintenance and make the fortress a place for the general public. Friends of Oscarsborg Fortress works actively for the good of the fortress. Anyone interested can become a member of this organization.

Every day throughout the year there is a ferry connection from Drøbak to Oscarsborg Fortress. The ferry ride from Drøbak takes about 10 minutes. If the weather is good, we recommend going up on the sun deck. Check ferry times in advance of your visit as there are summer and winter routes for the ferry. The boat to Oscarsborg runs all year round. For updated ferry times, click HERE!

the castle boat


Tickets can be purchased at the ticket machine at Sundbrygga and Sjøtorget. Both cash and debit cards can be used. The ticket is valid round trip.


The boat leaves from Sjøtorget in the center or from Sundbrygga. There are good parking facilities in the center. There are no parking options at Sundbrygga. There is a paid car park at Husvik, about 200 meters from the ferry quay.

During the summer, there are also ferry departures with routes B21 and B22 from Aker Brygge. Read more about the trip and departure times HERE!


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