Absolutely worth the visit if you are physically fit to hike some hours in beautiful nature. Remember to go there early, it is not recommended to get stuck in the mountain after sunset if you are not used to hiking in the region.
Akerhus Fortress its bulid 1290 by king Haakon replacing Tønsberg as one of the two most important Norwegian castles of the period , its protect oslo .
Akershus has also been a prison,Particularly well-known people to have been imprisoned there include author Gjest Baardsen (1791–1849), and the similarly idealized thief Ole Høiland.
the movie , Princess Elisa and Anna, the castle is supposed to be based on the Akershus Fortress