Alex C.
Google
As well as the synagogue itself, which you can view from balconies, there are a couple of floors of Jewish museum, one focused on artifacts from the Jewish community in Wroclaw and around Poland (silverwear, books etc), and another with information about the treatment of Jews historically, and in Poland post war and post 1989. Plenty of info in English, free entry, worth an hour of your time. My favourite learning is that the WWII era King of Denmark used to purposefully wear a yellow badge, and encouraged all Danes to do likewise so the Nazis found it harder to identify Jews . I don't know if it's connected, but I understand Denmark's jews were not cleared as in other occupied parts of europe.