Within Warsaw's Citadel , this museum preserves a wing of a former political prison. Cells are labelled with names of the more famous prisoners incarcerated here, including Józef Piłsudski, who did time in cell 25. Inside are paintings by Alexander Sochaczewski (1843–1923), a former inmate who, along with 20,000 other anti-Russian insurgents, was transported to the labour camps of Siberia in 1866. The paintings, such as the huge Pożegnanie Europy (Farewell to Europe), depict the suffering of his fellow prisoners.