Perched along the banks of the Oslofjord, Akershus Fortress (Akershus Festning) is a historic medieval castle and former royal residence built around the late 1290s under King Haakon V. Constructed to protect Oslo after an earlier attack, this formidable stronghold historically ruled Norway and famously survived every enemy siege. Over the centuries, it evolved from a royal seat—where monarchs like King Haakon V and Queen Margaret lived—into a modernized Renaissance castle, a military base, and a notorious prison known as 'The Slavery.' Today, the active military complex serves as a venue for state dinners, hosts the temporary office of Norway's prime minister, and welcomes you to explore its centuries of rich history.
When you visit, you can stroll through the expansive grounds to admire Italian-inspired bastions, dramatic towers, and historic halls. Beyond its striking architecture, you can explore the Royal Mausoleum—the final resting place of notable Norwegian royals including King Haakon VII and King Olav V. You can also stop by Norway's Resistance Museum and the Norwegian Armed Forces Museum located right on-site.
Don't miss snap-worthy photos near stationary guards from His Majesty the King's Guard, who still protect this legendary landmark daily.
What to see at Akershus Fortress
- Explore historic medieval architecture and Italian-inspired Renaissance bastions along the Oslofjord waterfront.
- Pay respects at the Royal Mausoleum, resting place of monarchs including King Haakon VII and King Olav V.
- Visit on-site history exhibits at Norway's Resistance Museum and the Norwegian Armed Forces Museum.
- Snap pictures at the entrance guard post, a popular photo spot featuring His Majesty the King's Guard.
Visiting tips
Be sure to stop by the stationary guard post near the entrance for a popular photo opportunity with His Majesty the King's Guard.
How long: 1-2 hours · Best time: 6:00 to 21:00 daily
How to get there & what’s nearby
Akershus Fortress is easy to reach on Oslo’s public transport, and pairs naturally with Oslo Opera House. For where to stay, the weather and full itineraries, see our Oslo travel guide.
See the full Oslo travel guide for where to stay, the best time to visit and the top things to do.