Joutsijärvi, Kemijärvi, Finland

In Joutsijärvi, Kemijärvi, there's a "self-service museum" type of WW2 bunker that has been restored and tidied-up nicely. The restorer and keeper of the sightseeing is the local village club so it might well be possible to get a permission to use it for shots, too.

http://tinyurl.com/5tyxar - there are some pictures of it.

http://www.panoramio.com/photo/6395374 - another picture with location info.