I'm guessing the trip wasn't a happy one... not entirely, at least. I'm also guessing your trip to Poland included a visit to the camps--at least, your imagery points to that ('work will set you free'? wasn't that over the gate to one of them?)
Regardless of the actual content--this is beautiful in a sad and dark kind of way. Whether it's a shanty beside the railroad tracks, or a tenement in the ghetto, or... whatever.
I'm not so sure I like the line breaks. I get that you're trying to fixate upon a form... I guess I'm ambivalent. You didn't make all your stanzas worth three lines--some continue to the next, some are shorter--so props to that. and you ended differently. So never mind about all that :)
And while I'm on the ending, I'll mention that I absolutely love it. It hurts my heart, a little. It makes me wrinkle my brow. I'm listening to super sad music too right now, so... it just adds to that aura of unhappiness.