Auschwitz

One of the points of my trip to Poland wasn't so relaxing and nice. But important and emotionally moving.
One word... Auschwitz. Important for me not only because I'm Polish person, but also as one that lost member of a family there. The tour guide was in English and very informative. I think it's one of those places that it's a must to see while being in Poland.

 Auschwitz II Birkenau