xyzzy, when I called before I said I had an American passport. They said I need the permission from the Museum's director, but that that wasn't a problem.

It would be good if you can arrange a tour beforehand, and have someone translate, because I joined a two-person group, one of whom translated the other guy was a reporter for some magazine from scandinavia (if I recall correctly) and the tour guide was a former air force man (pretty high rank).