In 60 seconds
Historic border kingdom straddling the Alssund strait on the island of Als, featuring the 12th-century moated Sønderborg Castle, Queen Dorothea's intact Renaissance chapel, the pivotal 1864 battlefield of Dybbøl Banke and Frank Gehry's waterfront promenade.
Best for
Known for
Skip if
You are looking for dense urban metropolis energy rather than border-history contemplation and gentle coastal island nature.
Your match
Choose a few travel interests and we will show how well Sønderborg & Als fits them. Choose interests
See
The things that would make the trip incomplete without them.
Imposing 13th-century four-winged coastal fortress on the Alssund, holding centuries of Schleswig-Holstein border history and the intact 1570 Queen Dorothea Renaissance chapel
Tour the Great Hall, see King Christian II's legendary round table in captivity and admire the alabaster altarpiece in the royal chapel.
Historic battlefield and windmill museum commemorating the decisive April 18, 1864 siege during the Second Schleswig War against Prussian forces
Walk through reconstructed redoubts, hear cannon demonstrations and climb Dybbøl Mill for views over Als and Flensburg Fjord.
Frank Gehry-masterplanned harbour promenade holding Henning Larsen's landmark brick Alsik Hotel with a 17th-floor public observation deck
Ride the elevator to the 360-degree viewing platform for vistas over the Alssund strait and German borderlands.
Eat
A short list, kept short on purpose. Each entry answers one question: when is this the right choice?
Too few picks yet for their own heading, so they share this list.
Historic harbourside tavern in central Sønderborg renowned for enormous traditional Danish 'wienerschnitzel' and classic smørrebrød
A beloved local culinary landmark since 1934.
Elegant regional dining room on the Sønderborg harbour promenade celebrating South Jutland meats, fish and farm cheeses
Enjoy casual Nordic dining by the water.
Michelin-starred fine dining restaurant on the 17th floor of Alsik Hotel helmed by master chef Jesper Koch
Book an unforgettable multi-course tasting menu paired with panoramic sunset views over the water.
Charming specialty coffee house on Perlegade serving artisan pour-overs, homemade sourdough sandwiches and cakes
Sit in the quiet courtyard on the pedestrian street.
Beyond the obvious
Less obvious, rarely queued for, and usually the part people remember.
Magnificent 1770s white rococo ducal palace and landscaped park on Augustenborg Fjord, the ancestral seat of the Dukes of Augustenborg
Wander the lakeside avenues of lime trees and admire contemporary sculptures in the Augustiana art park.
84-kilometre historic border-patrol trail hugging the Danish-German coast along Flensburg Fjord from Padborg to Als
Hike the scenic final stage across Dybbøl and the Alssund bridge into Sønderborg.
High-tech adventure and science park in northern Als founded by Danfoss, exploring virtual reality, geysers and engineering
Experience the simulated glacier crevasse and outdoor science challenges.
After dark
Atmospheric cellar pub set in a half-timbered 1637 inn serving cold regional craft beers from Fuglsang and local breweries
A historic evening hideaway in the old town.
Orientation
How the city is actually divided, and what each part is for.
Historic quay beneath the castle towers, lined with traditional wooden yachts, restaurants and water views
The romantic historical heart of Sønderborg.
Elevated western ridge across the bridge holding the national memorial grounds, windmill and fortifications
The sacred landscape of Danish 1864 history.
Stay
Areas rather than hotels — pick the right one and the rest follows.
World-class contemporary hotel on the harbourfront designed by Henning Larsen Architects
Luxury Nordic spa, Michelin dining and waterfront location.
Historic town hotels near Perlegade and the castle
Convenient for walking and local dining.
Practical
Plan this trip — useful links
Context
Enough to make what you are looking at legible.
Valdemar the Great builds a fortified tower on the island of Als to defend against Wendish pirate raids.
Prussian artillery storms the Dybbøl redoubts, forcing Denmark to cede the duchies of Schleswig and Holstein until the 1920 border plebiscite.
Following World War I, the people of Northern Schleswig vote to reunite with Denmark in the historic Genforeningen.
Further out
Worth a day if you have one to spare.
Historic rum and sailing port across the German border
Experience the seamless Danish-German border region culture.
UNESCO Moravian town and royal fortress Koldinghus
Connect border history with UNESCO heritage.
