When I was in Finland in 2012, my son and I went and looked at some of the fortifications in Joensuu. There was a small history museum in one of the bunkers that was very good.
http://www.youtube.com/watch?feature=player_embedded&v=TwQmwbQttkY
What a small world this is! I live about one km from the bunker museum. Had I known, we could have met over a nice cup of coffee or something like that.