This museum turned out to not be part of the 1€ Sunday museums. It is 4,50€ for adults but 3€ for students. There are only 4-5 rooms to see in this white Baroque building. It focuses on life in the Alps, primarily the Jewish community before-during-after the war, as well as the Nazi period.
I think it was worth 1€ but perhaps they need donations — for what, I know not.