I admit it, the whole point is to impress you with my random historical knowledge!
Oh, OK ;D In all seriousness, though, I am impressed, actually :) I'm even more impressed with jon357 solving your riddle (I'd have to live in that area to know all of this, I suppose)! Chemikiem was right on both accounts: that was one nightmare riddle and it looks like you're worse than pawian ;D
Is it part of some sort of display?
Yes, it is! :)
Is it a rock or stone?
Kind of... but not quite. It's something more :)
Thanks for the link about the grom selection, very interesting. I've always wanted to go to Bieszczady.
You're welcome :) What's interesting about Bieszczady is not only the unspoiled, wild nature part, remoteness, but also the history - there are ruins scuttered around the area, remnants of cemeteries, Orthodox churches, road signs for villages that don't exist anymore... All of this put together makes those mountains quite mysterious, somewhat magical, I guess :) That's cool that you've been invited by the locals - if I were you, I'd definitely take that opportunity and visit!
@jon357, isn't that the canal lock in Leśniewo Górne? Are those "two ladies" rivers?
@delph, I don't know this building, all I can say is that it does look Western... Is it a railway station, as jon357 wrote?