The story
The museum is located in a seaplane hangar, built by German occupation forces during World War II. The German seaplane base Seefliegerhorst Aalborg was established there in 1940. Following the war, the hangar was used as a storage depot for equipment of the Danish Civil Defence Forces. In August 2001, the hangar was provided to the Garrison Historical Society of Aalborg for the creation of a military museum. The building was renovated and the museum opened on 22 June 2002. In 2009 a second exhibition hall was opened creating a total exhibit area of approximately 15,000 square metres (160,000 sq ft).
From Wikipedia’s article on Defence and Garrison Museum, shared under CC BY-SA 4.0.5