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Castles and ruins

Photo: Conni Ernst

Kings and Queens have been living Sønderborg, of own free will as well as imprisoned. Ducal families has left their trace and every summer the focus is set on Gråsten Castle, when the royal family is on their yearly holiday at the castle by the lake.

King III Sweyn Grathe (King Svend Grathe) built the first castle on Northern Als! It is this Sweyn, who becomes the byname Grathe after being killed in 1157 in a fight for the royal power in Denmark, on the heath Grathe Hede.

Medieval castles

Around 1150, a castle is built on the northern part of island Als as protection against the Wends. King III Sweyn name it Alsborg a name it keeps for the next 20 years. Around 1168, the problems with the Wends ravaging is back, this time on the southern part of island Als. That is why King Valdemar the Great buil a castle at the southern passage to the sound Als Sund. The new castle is named Søndre Borg and Alsborg is renamed Nørre Borg.

There were no cities. The castles were placed out of a strategic point of view; they had to be easy to defend. The cities Købingsmark, later renamed Nordborg and Sønderborg sprouted under the protection of the castles.

Nordborg Castle - Entrance to the first castle built on island Als in the Sønderborg-area

Nordborg Castle

Photo: Conni Ernst

Like many other medieval castles, Nordborg Castle has been through alterations during its time. After the Reunification in 1920, the castle becomes a Danish continuation school for boys in the winter and girls in the summer. Present day it is a school for girls and boys. You can walk around the park and see the buildings from the outside.

Sønderborg Castle on island Als in the Sønderborg-area

Sønderborg Castle

Photo: Foto4you

Since 1532, Sønderborg Castle has been an especially part of Danish history, when King Christian II is imprisoned here – but did he really make a groove in a round table with his thumb?  Get an answer at the Museum in Sønderborg Castle.

Ducal castles

During the rule of the Dukes the old medieval castles is modernized and new castles in baroque style is built in Augustenborg and Gråsten. Unfortunately, not all of these historical buildings has survived.

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Østerholm Castle ruin
Photo: Conni Ernst

Østerholm Castle ruin

Present days there are three castles on the island of Als, but there used to be four.

At the small village Østerholm, near the forest Nørreskoven, you can see the foundation stones of Østerholm Castl...

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Gråsten Palace
Photo: VisitSønderborg

Gråsten Palace

Summer resident of the royal family

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Augustenborg Palace
Photo: VisitSønderborg

Augustenborg Palace

Augustenborg Palace is one of the most beautiful baroque palaces in Denmark.

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The castle south of the border - Remember Passport!

Duke Hans the Younger builds a beautiful water castle in 1583-87 and this is where he dies, during a stay in 1622.

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Glücksburg Castle - Germany
Photo: VisitSønderborg

Glücksburg Castle - Germany

The water castle, built by Duke Hans the Younger - the progenitor of the royal family in Denmark

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