Tom J.
Google
Good museum, however can be difficult to locate- you need to go around the corner from the main stairs into the Imperial Castle and through a small door, then down some stairs and inside there is a manned ticket desk.
The museum is small but full of information about the events in Poznan during 1956, however if your command of the Polish language is not proficient you miss out on a lot of the information as it is not translated into English.
If my Polish was better at the time, I am sure this would be a 5-star experience.