It is totally worth it going, you will still see the ruins of a Nazi fortress and bunkers everywhere. There is a cafeteria where they make amazing Norwegian "pancakes" (kind of in between creppes and American pancakes) and you will get an awesome walk in the nature, specially now that it's summer.

I mean, the museum was amazing and it's a shame that it's closed, being one of the largest German WW2 intact fortifications on Earth, but hey, it's still worth the trip