I almost want to take a trip around Norway and document all the remnants from Germany's autistic trip up here back in the early 40s. We've got the Gneisenau cannon posted above, the Adolf cannons intended for the H-class battleships that were meant to succeed the Bismarck-class, and several of the U-boat bunkers the Germans built which are still in use (and I know two people who worked on the U-boat bunker in my town).
We also have a ton of forts, airfields, cannon emplacements and 88s. I think almost every Norwegian kid grew up playing in old German forts and flak batteries.
A few years ago, you could even dive near the mostly intact wreck of Georg Thiele, but I think it's been reduced to almost nothing by now.