Today we took a family tour of the Nidaros cathedral. For 600 kr. you can book a private tour, which we did with another family. This made it a pretty good deal. I have never had a tour of the cathedral before -- and I enjoyed it very much. Unfortunately, the eastern section was having the stones cleaned, so we missed the very best parts (they should have told us that when we booked it). But our guide was very good and plenty to tell us about the other parts of church. We got a tour of the crypts below as well.
We'll book another private tour this summer, and see the other parts as well as the tower.
Photos aren't allowed inside, so here's a beautiful drawing by Henning Meyer instead.