Just south of Oslo, the German navy began in 1940 to build a facility for its own personnel. The camp was built by Soviet and Norwegian prisoners of war and was completed in 1942. It was typical of the time and consisted of barracks (two floors), administration, guardhouse, garage, workshops, exhibition hall, shelters and parking space. The camp was not demolished after the war but filled other purposes, both military and civilian.

Current status: Preserved (2023).

Location: 59°52' 49.13" N 10°46' 04.86" E

Get there: Car.

My comment:

In 2018, the camp and it’s buildings was declared noteable buildings and is therefore under cultural-historical protection. Although it was the Germans who built the camp, that is precisely why it is protected as a memory of German building art during the war.

Follow up in books: Greene, Jack, Massignani, Alessandro: Hitler Strikes North: The Nazi Invasion of Norway & Denmark, April 9, 1940 (2013).