- virtualglobetrotting.com map/s-nderborg-castle/Explore Sønderborg Castle in Sønderborg, Denmark as it appears on Google Maps and Bing Maps as well as pictures, stories and other notable nearby...
- komoot.com guide/370002/castles-in-snderborg...hike outdoors or walk your way around the grounds with a guide — is always something special, and you’ve got 4 beautiful castles to choose from in Sønderborg.
- sights2see.com denmark/sønderborg-castle/2657Sønderborg Castle. Sønderborg Castle (Danish: Sønderborg Slot) is located in the town of Sønderborg, Denmark on the island of Als in South Jutland.
- vikingeskibsmuseet.dk en/professions/education/…Als was a popular place to live in the Viking Age, and at Sønderborg Castle you can discover fascinating aspects of Viking life there.
- OpenTripMap.com en/card/R2415351Sønderborg Castle (Danish: Sønderborg Slot) is located in the town of Sønderborg, Denmark on the island of Als in South Jutland.
- en.tierient.com sennerborg-castle/The castle of Sønderborg is a real impregnable fortress located on the island of Als, which has been diligently built for centuries and against numerous armies...
- britannica.com place/SonderborgIt was founded in the mid-13th century around Sønderborg Castle and chartered in 1461. King Christian II was a prisoner at the castle 1532–49.
- 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.
- 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.
- conferences.au.dk arkiv-nat-tech/…Both King Hans and his son Christian II extended Sønderborg Castle and made it into one of the country's strongest fortresses.