Sønderborg Slot is a medieval castle sitting right on the Alssund strait, with origins dating to the 12th century. It served as a prison for the captive King Christian II for 16 years. Today it houses Museum Sønderjylland - Sønderborg Slot, with permanent exhibitions covering the region's history from the Viking Age to the reunification of 1920.
A guided tour through Thomas Kluge's portrait exhibition at Sønderborg Slot, featuring 37 official works of royalty, politicians and cultural figures.
Guided tour of the royal burial chapel at Sønderborg Slot, where 46 members of the Danish royal house are interred. The chapel opens only for these special tours.
L.I.G.A performs free at Slotscenen as part of Culture and Sports Night 2026. The duo blends pop, soul, rock and funk.
Zididada brings a free concert to Slotscenen during Culture and Sports Night. The seasoned Danish band delivers celebration and positive songs at Sønderborg Slot.
Ensemble 1585 and mezzo-soprano Kamma Bidstrup perform three Bach cantatas at Sønderborg Castle. A specialist Baroque ensemble meets an accomplished soloist in classical music.
Historian Carsten Porskrog Rasmussen traces Sønderborg's economic transformation from 1864 to 1970, from maritime prosperity to industrial growth driven by military installations.
Autumn holiday workshop at Sønderborg Castle where children and adults can design their own coat of arms inspired by the ducal family's historic shields. The workshop runs all week from 11:00-15:00 with free entry.
Christmas market at Sønderborg Castle with over 80 exhibitors, Father Christmas, and new children's activities including dressing up in ducal costumes and a Christmas decoration workshop.
Swedish-Norwegian violinist Johan Dalene performs at Sønderborg Slot with pianist Christian Ihle Hadland in a programme of Nordic classical music from the Romantic era to the present.
Sønderborg Slot offers free guided tours on Herregårdenes Dag, exploring 800 years of history, royal dungeons, and a children's room where kids can make crowns and dress in period costumes.