Muzeum Martyrologii w Słońsku

The museum occupies the grounds of a former prison in Słońsk, where in 1933 the Nazis opened Sonnenburg, one of their first concentration camps. The prison dated from the 1830s, and the camp held parliamentarians, intellectuals and political prisoners, among them the writers Carl von Ossietzky and Erich Mühsam. It is a memorial to the victims on a site with two centuries of history.