The museum collection focuses on Norwegian resistance during the occupation of Norway by Nazi Germany from 1940 to 1945.

The museum displays equipment, photos and documents from the war years.

[2] The Museum was opened to the public in May 1970 by Crown Prince Harald of Norway in celebration of the 25th anniversary of Norwegian liberation.

Architectural planning was entrusted to Norwegian architect Otto Torgersen (1910-2000) who working together with key personnel representing various branches of the underground forces, produced a chronological gallery through the period from the prelude in the 1930s onwards to liberation in 1945.

[4] Arnfinn Moland was appointed manager of the museum in 1995.