Sønderborg Castle

Sønderborg Castle is reckoned to date back as far as 1158, when it was said to be founded by Valdemar the Great as a fortified tower. Over the centuries the castle has been enlarged and rebuilt.

The Sønderborg Castle Museum houses local history collections from the Middle Ages to the present day, but with focus on the Schleswig wars of 1848-50 and 1864.