We went to Tampere in Finland this summer for some sports event. We asked in Tampere tourist office about highlights in the surrounding area. They recommend a visit in the claimingly smallest museum in the world. They gave us the address and we passed by it without recognizing it at first since we thought it was a bus stop. Here it is. It is showing the history of cows, milk etc. in the war time.
Got a post with a photo from Lüchow in Germany "competing" against it: