Museum of the History of Polish Jews POLIN
One of the best museums in Warsaw. Jews used to be a very important part of the Polish cultural landscape. The exhibition will take you on a journey through the 1000 years of Jewish communities in Poland.
Pro tip: at first you will be tempted to read every bit of information. Don't. The exhibition is just too big for that. Also, the medieval period might be the least interesting part of the museum.