My family from the mother's side was pre-war Polish nobility, and my family used to own huge amounts of land, a manor and even two whole villages! Then the commies came and... yeah. Over the years managed to steal pretty much everything my family had (well, one village ended up sold earlier, due to it's financial troubles). All that's left of it is an endless lawsuit conducted by a great-uncle of mine and (maybe) his descendants and a claim to a coat of arms which I'm planning to pursue if I'll ever have money to spend.
From my father's side, much less is known due to them being from Eastern Poland, also known as Ukrainian SSR after WWII. There were nobility, that's for sure, but there doesn't seem to be anything left from their holdings. Considering what did they thought of nobility in the USSR, records might be hard to come by. My paternal grandparents are respected scientists and teachers (though not too well known outside Poland), and that's what the family is known for nowadays. We're upper-middle class now, which is quite good for this country, all things considered. I'm mostly interested in the coat of arms now, though I suppose a compensation for the village would be something, too.