Akershus Fortress is one of the most “easy-to-discover” sights in Oslo. Just walk down to Aker Brygge and you will see the fortress guarding the city from intruders using boat. The fortress built during the 1300s is today a major tourist attraction. It has been renovated a couple of times during history, the latest renovation work started in 1889.
If you are interested there is a daily changing of the guards at 13.30.
Akershus Fortress Oslo
Akershus festning, 0015 Oslo
Akershus Fortress pictures