Are you particularly interested in war history, there are several visual remains along the Norwegian coast. Some of the remains are what is locally called "Hitlertennene"; the teeth of Hitler. They are big blocks of stone, and was part of a chain of coastal forts to avoid allied invasions.
Hinterlassenschaften des Zweiten Weltkriegs am Rv 44 bei Brusand. Gegossene Betonblöcke sollten die Alliierten an einer Landung hindern.