Sønderborg is a lovely market town with a beautiful castle that has protected the town for hundreds of years. Sønderborg and Als are connected to mainland Jylland via the stunning King Christian X Bridge. The town is a popular destination for pleasure boaters. At the Sønderborg Castle, you can visit many historical exhibitions about Sønderjylland and Schleswig, going back 800 years. If you would like to experience Sønderborg from the top, you must visit ‘The Point of View’ viewing-platform at the new Hotel Alsik.