Since 2004, the City Museum of Iserlohn has managed the former air-raid shelter tunnel in the old town, where about 2,000 people from Iserlohn could seek shelter during air raids in the final phase of World War II.
Due to its metal industry, Iserlohn produced war-relevant products during World War II and thus became a target for air raids. The need to implement protective measures for the population became evident at least by 1943. Construction of the air-raid shelter tunnel beneath the Oberste Stadtkirche began at the end of 1943. Originally planned to be 500 to 550 meters long, the shelter was meant to accommodate up to 6,600 people. By the end of the war, only about 200 meters of tunnel length had been completed. Prisoners of war were used for construction, and they were not allowed to enter the tunnel during attacks; Jews were also prohibited from accessing the shelter.
The air-raid shelter tunnel can only be visited as part of a guided tour. As a safety measure, wearing a helmet is required, which is provided by the City Museum. Dates for public tours are announced on the website of the Iserlohn Municipal Museums.