- outdooractive.com en/poi/denmark/sonderborg-…The town of Sønderborg arose under the protection of the castle. The strong castle was used as a prison for the Danish King Christian II from 1532 to 1549.
- wikidata.org wiki/Q473434imported from Wikimedia project. Russian Wikipedia. image. Das Schloss Sonderburg am 18. April 2014, Bild 05.JPG5,184 × 3,456; 7.62 MB. point in time. 18 April 2014.
- castlestudiestrust.org blog/tag/sonderborg-castle/Within three days he was able to bring Nordborg Castle (Eng: North Castle) under his control, making the conquest of Sønderborg only a matter of time.
- commons.wikimedia.org wiki/Category:Sønderborg_…...grad na Danskem; château au Danemark; museum di Denmark; מוזיאון בדנמרק; museum in Sønderborg, Denemarken; Schloss in Dänemark; danskt slott; castle in.
- tripendy.com location/sonderborg-castle-museumSønderborg Castle, dating back to 1158, had changed ownership many times until it came into the hands of the Dukes of Augustenburg from 1764 until 1921.
- travel.sygic.com en/poi/sonderborg-castle-poi:…Sønderborg Castle is located in the town of Sønderborg, Denmark on the island of Als in South Jutland.
- triphobo.com places/s-nderborg-denmark/s-nderborg…Opening & closing timings, parking options, restaurants nearby or what to see on your visit to Sonderborg Castle?
- hellotravel.com denmark/sonderborg-castleSonderborg Castle commenced probable as a fortified tower constructed by using Valdemar the Great in 1158, built on an islet in Als Strait that later was...
- touristportalen.gitlab.io sonderborg1495/…The same architect in 1568 a chapel was built in the castle Sønderborg for exiled Queen Dorothea.