craftsmanship. The museum has a permanent exhibition of preserved parts from the Renaissance organ, including a rat's nest taken from one of the organ’s bellows. The Great Hall The Great Hall (Riddersal) is 34 meters long and was the reception room for ducal guests, and the scene of parties and dances. The room is still used for special events, such as in connection with the marriage of Queen Margrethe II's niece, Princess Alexandra of Sayn-Wittgenstein-Berleburg to Count Jefferson-Friedrich von Pfeil und Klein-Ellguth in 1998. Management Sønderborg Castle is owned by the Danish state, run by the Palaces and Properties Agency (Slots- og Ejendomsstyrelsen) and used by Sønderborg Castle Museum, which is jointly owned by the municipality of Sønderborg and by South Jutland County. References Other sources Otto Norn, Jørgen Paulsen and Jørgen Slettebo, Sønderborg Slot. Historie og bygning, G.E.C. Gad forlag, 1963. External links Palaces and Properties Agency site on Sønderborg Castle Sønderborg Castle Museum (in Danish only) The Association of Castles and Museums around the Baltic Sea Buildings and structures completed in 1158 Buildings and structures completed in 1350 Castles in Denmark Listed buildings and structures in Sønderborg Municipality Museums in the Region of Southern Denmark Castles in the Region of Southern Denmark History museums in Denmark Museum Sønderjylland Sønderborg