Akershus Fortress

Akershus Fortress is a medieval stronghold beside Oslo’s harbour, with paths through stone walls, courtyards and cannon-lined grounds. Built from the late 13th century to defend the city, it later developed into a royal residence and military site. Walk the ramparts for views across the Oslofjord, where ferries and ships pass the waterfront, or visit museums on the grounds for exhibits on Norwegian history and the Second World War. The outdoor grounds are free to enter; check which museums are open before planning an indoor visit.

A fortress built to defend Oslo

Construction began in the late 13th century, when King Håkon V ordered a stronghold on the eastern side of the harbour to protect the city. Oslo became Norway’s capital in 1299. Over the centuries, the complex was extended and changed, and by 1592 it had developed into a fortress armed with cannons.

The site includes a medieval castle, fortress buildings and active military installations. Its position above the harbour gave it a strategic role in defending Oslo, and the walls remain part of the city’s waterfront today.

Walking the grounds and visiting museums

Paths lead between the fortress walls, courtyards and cannons, with views towards the harbour and Oslofjord. The grounds are free to enter, so you can come for a walk and take in the setting without planning a museum visit.

Museums on the site cover Norwegian history and the Second World War. Opening schedules can differ by area and season; check ahead if a particular museum is central to your visit. Akershus Castle is closed for renovations, so check its status before making plans to go inside.