I visited in here during my summer vacation to Finland. This airfield was base of HLeLv 24, Täyd. Lelv 35 and PLeLv 48 1939 - 1944. 1947 the Finnish Air Force commander ordered that there should be one of each fabric-coated planes of Finnish AF preserved to museums, and they would be stored to this hangar. As you can see, it is quite packed still.
This is more like collection waiting to be restored, and they are doing that, one plane at the time. There are one and only remaining Blackburn Ripon and Aero A32 in this hangar plus some Finnish rarities. The museum guide for us was former Finnish AF MiG pilot.