The Citadel was built in Warsaw by order of Tsar Nicholas I after Polish November Uprising in 1830. The fortress in a shape of a pentagon i a massive brick walled structure enclosing an area of 36 hectares. Its construction required the demolition of 76 residential buildings and the forcible resettlement of 15,000 inhabitants. Some 5,000 Russian troops were stationed there and over 3,000 Polish political prisoners were kept here in prisons cells; many of them were executed here as well. At present it is one of the best-preserved buildings of defensive architecture in Poland. The exhibitions illustrate the history of the Polish struggle for national liberation and present profiles of people who had been incarcerated there.