OB 21cm Mörser 18 is a German World War II artillery bunker located in Norway. This bunker was part of the Atlantic Wall fortifications built by Nazi Germany to defend occupied territories against Allied invasion. The designation 'OB' refers to 'Objekt' (object) in German military terminology, while 'Mörser 18' indicates it was designed to house a 21cm Mörser 18 heavy howitzer, a powerful artillery piece used by German forces during the war.
The bunker represents Norway's strategic importance during WWII as a key location for German coastal defenses. These fortifications were constructed along Norway's extensive coastline to protect against potential Allied naval and amphibious operations. The 21cm Mörser 18 was a formidable weapon capable of firing heavy shells at long ranges, making such bunkers crucial defensive positions in the German military strategy for occupied Norway.