The Danish Queen Margrethe I built Brundlund Castle in the 1400s. It was used as the official residence for the County Prefects. Today the castle is a museum of art housing over 1000 works, mostly by artists from Sønderjylland from the 1700s until present day. The most famous names in the collection are C W. Eckersberg, C. A. Jensen, Sven Wiig Hansen and Franciska Clausen. The park around the castle is a beautiful place for an excursion, right in the middle of Aabenraa town.