Fun with Google Maps

[Adm.Lee]

So, I was looking at the satellite pictures, getting map ideas for my Marines- in-northern-Poland game, when I see something intriguing. At least, to me, who is not a professional photointerpreter.

East of Kwidzyn and Grudziadz, there's a bunch of small lakes and a forest. In the very small village of Kamieniec, I see a large building, no roof, shaped like a reverse "C". Huh, I think, must be an old noble's estate; after all, this used to be Prussia.

Then, I look NE of the "manor house" and see that the woods have lots of regular shapes in them, with square corners. Now, that could be hunting trails or something, but it sure looks like very large building outlines, or former farm fields, or something. Perhaps a WW2 barracks/base? I can't make out a runway. Wikipedia indicates it's not a concentration camp.

Any ideas? It could just be lots of farmland, abandoned to woods.