I have worked on the Bing images and sometimes you find things you can't quite make out what it is. At osm.org/?lat=56.21111&lon=21.15347&zoom=16&layers=M I think it's some kind of racetrack in the middle of nowhere.

At osm.org/?lat=56.15369&lon=21.13021&zoom=15&layers=M there is a grid pattern of roads. I think they might be logging roads.

What is it at osm.org/?lat=56.47042&lon=21.00979&zoom=16&layers=M ? Alottment gardens? It might also be one at osm.org/?lat=56.52087&lon=21.08109&zoom=16&layers=M