It's not the most exciting museum I have been to I must admit. Seemed like a very old museum. The exhibition is basically about the technology that was used in wartime in norway. One can see tanks, guns, vehicles, uniforms etc.
I was there on a day when the entrance was free so I don't know how much the ticket costs. However I don't think I would be happy to pay for it. However I had a good time there and i had fun with the torch exploration organized for culture night.
If you are a tourist there are so many more museums to prioritize. If you live in Oslo and seen all the other museums this can be nice to visit too. read more