Warsaw Citadel (Polish: Cytadela) is one of the best preserved complexes of fortified architecture in Poland. The red-brick pentagonal fortress was built between 1832-1874 by personal order of Tsar Nicholas I after the suppression of the 1830 November Uprising. The Citadel encloses an area of 36 hectares and features 104 casemates. It served as a prison into the late 1930's, mostly for political prisoners. During WWII the fortress served as a German headquarters. The Citadel survived the Second World War and in 1945 became the Polish Army property again. It houses a Museum featuring prisoners' memorabilia and documents as well as the prison cells. The Citadel also comprises a symbolic cemetery and a park.