Brundlund Castle and Art Museum
Brundlund Castle, begun under Queen Margrethe I and with roots in the 15th century, is now an art museum holding Denmark's most important collection of Danish Surrealism, shown in changing exhibitions in the historic rooms. Sculptures stand in the castle park, and the cafe terrace looks over the gardens. Adult admission is DKK 90; under-18s enter free.
Cultural History Museum Aabenraa
The town's cultural history museum tells the story of Aabenraa's merchant shipping and seafarers, with exotic souvenirs brought home from voyages and one of Denmark's largest collections of ship portraits. The building has no lift. Adult admission is DKK 60; under-18s enter free.
Graasten Palace
The Danish royal family's summer residence, a white palace with a palace church preserved from the earlier palace. The romantic palace garden is open to the public when the royal family is not in residence, and the Royal Kitchen Garden has a garden market with a cafe.
Sonderborg Castle
A castle of nearly 800 years on the Sonderborg waterfront, now a museum of Southern Jutland history, from the dukes of Schleswig and the Schleswig Wars to the reunification with Denmark. King Christian II was held captive here for 17 years, and Queen Dorothea's Chapel is the oldest surviving Renaissance room in the Nordic region. Adult admission is DKK 115; under-18s enter free.