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Southern Denmark

Sønderborg

Top 17 Castles in Sønderborg

Castles in Sønderborg offer a rich historical tapestry, with the region featuring a variety of historical sites. Located in Denmark, the area is characterized by its strategic position overlooking the Alssund strait and its connection to the island of Als. Visitors can explore 17 castles, each providing unique insights into the history and culture of Sønderjylland. The landscape combines coastal views with historical architecture, making it a destination for those interested in Danish heritage.

Best castles in Sønderborg

  • The most popular castles is Augustenborg Palace, a castle that is the largest residential building in the region. This Baroque palace, built from 1661, features a grand main building and extensive palace gardens that are open to the public.
  • Another must-see spot is Gråsten Palace, a historical site. This snow-white palace serves as the summer residence for the Danish Royal Family, with its English-style gardens and palace church open to the public when the royal family is not in residence.
  • Visitors also love Nordborg Castle, a historical castle. Originally founded around 1150, it was rebuilt in 1910 and now functions as a boarding school, with its historic courtyard and peaceful gardens accessible to the public.
  • Sønderborg is known for its Renaissance castles, Baroque palaces, and historic defensive structures. The region offers a variety of castles to see and explore, from royal residences to former defensive strongholds.
  • The castles in Sønderborg are appreciated by the komoot community, with more than 2100 upvotes and over 1300 photos shared by visitors.

Last updated: June 24, 2026

Glücksburg Castle

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Glücksburg Castle near Flensburg is one of the most important residential castles in Northern Germany.

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View of Glücksburg Castle

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1a view of the Glücksburg moated castle.

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Glücksburg Castle Park

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Great avenue to the castle. Well maintained

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Nordborg Castle

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The castle was rebuilt in 1910. A further education school was built in 1921 by the merchant Johan Hansen from Copenhagen. The castle is used as a boarding school and can only be viewed from the outside. The castle park is open from 10 a.m. to 5 p.m.

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Augustenborg Palace

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Only part of the castle is open to the public, otherwise the castle is used by the authorities.

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Tips from the Community

Antje
August 29, 2025, Augustenborg Palace

A lovely café with delicious cappuccino and cake. In the village, beautiful old houses, but otherwise, more like—well, a place!

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The castle itself cannot be visited, but the castle park and the castle church are freely accessible

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Augustenborg (German Augustenburg) is a town in the municipality of Sønderborg, Region Syddanmark, Denmark. It is located on the island of Als (German Alsen). On January 1, 2023, the town had a population of 3,160. Until December 31, 2006, Augustenborg was an independent municipality in what was then Sønderjyllands Amt. Due to a municipal reform, various municipalities in Denmark and the offices were merged into the regions. In 1651, Duke Ernst Günther, who had the title of duke but no fiefdom of his own, bought several estates on Alsen from the Danish king. He had most of them demolished, but on the site of the most beautiful in the village of Stavensböl, Augustenborg Castle was built from 1661 (renovated from 1770 to 1776) and named after Ernst Günther's wife, Auguste von Sonderburg-Glücksburg. From then on, the castle was the headquarters of the ducal family of Augustenborg until 1852. The castle features stucco work by the Italian Michelangelo Taddei. The castle is not open to the public.

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The adjacent castle park with the “Orangery” and the hiking trail with the linden tree avenue around the castle pond is a real highlight 😊... The Orangery: Orange and lemon trees overwintered here 🍊🍋. But today the Orangery can be rented for art exhibitions, concerts and events 😉...

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Glücksburg Castle is one of the most important Renaissance castles in Northern Europe. It is beautifully located on the castle lake.

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Beautiful old castle situated in the lake

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Since the castle is now used as a boarding school, it is unfortunately not possible to look at it from the inside

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Take a walk around the lake (7 km) and see the castle from all sides.

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Frequently Asked Questions

What historical significance do the castles in Sønderborg hold?

The castles in Sønderborg are deeply rooted in the region's history, spanning nearly eight centuries. They served various roles from defensive strongholds against the Wends to royal residences and administrative centers. For instance, Augustenborg Palace showcases Baroque architecture, while Gråsten Palace is known as a summer residence for the Danish Royal Family. Nordborg Castle, one of Denmark's oldest, dates back to around 1150.

What makes Sønderborg Castle a significant historical site?

Sønderborg Castle is a central historical landmark with an almost eight-hundred-year history, strategically located overlooking the Alssund strait. It houses Museum Sønderjylland, which chronicles the region's history from the Middle Ages to the present, including the Schleswig wars and the reunification of 1920. Visitors can explore historical rooms, the unique Queen Dorothea's Chapel, and learn about King Christian II's 17-year imprisonment there.

Are there family-friendly activities at the castles in Sønderborg?

Yes, several castles offer family-friendly activities. Sønderborg Castle, for example, provides digital treasure hunts and interactive digital installations to engage children with Danish history. The extensive gardens of Augustenborg Palace and Gråsten Palace also offer pleasant spaces for families to explore.

When is the best time to visit the castles in Sønderborg?

The best time to visit the castles in Sønderborg generally depends on your interests. For exploring the palace gardens, especially at Gråsten Palace and Augustenborg Palace, the summer months (mid-June to early August) are ideal when the royal family is not in residence and the gardens are fully open. Indoor exhibitions at Sønderborg Castle are accessible year-round, making it a good option for any season.

What outdoor activities can I do near the castles in Sønderborg?

The Sønderborg area offers a variety of outdoor activities. You can find numerous hiking routes, such as the 'Sønderborg Heart Path' or sections of the 'Gendarmstien'. For cycling enthusiasts, there are gravel biking routes like the 'Beach View of the Baltic Sea – Sønderborg Castle loop'. Mountain biking trails are also available, including the 'Sønderborg Castle – Horuphav Marina loop'. You can find more details on these and other routes in the hiking, gravel biking, and MTB guides for Sønderborg.

Are there dining options at or near the castles?

Yes, Sønderborg Castle has a café where you can relax and enjoy local and regional specialties. Additionally, the towns surrounding the castles, such as Sønderborg and Augustenborg, offer various restaurants and cafes for visitors.

Can I visit Gråsten Palace, the royal summer residence?

While Gråsten Palace serves as the summer residence for the Danish Royal Family, its English-style gardens and the palace church are open to the public when the royal family is not in residence, typically from mid-June to early August. The Royal Kitchen Garden is also open during these times. You can also witness the ceremonial Changing of the Guard daily at noon when the King is present.

What is the history of Nordborg Castle and can I visit it?

Nordborg Castle, located on the island of Als, is one of Denmark's oldest castles, with origins dating back to around 1150. It was rebuilt in 1910 and now functions as a boarding school. While the interior is generally not accessible, visitors can explore the historic courtyard and wander through the peaceful gardens, which are open daily from 10 am to 5 pm.

Are there natural viewpoints or features near the castles?

Yes, the region offers several natural viewpoints and features. The castles themselves, like Sønderborg Castle overlooking the Alssund strait, provide scenic views. The extensive gardens of Augustenborg Palace and Gråsten Palace are known for their picturesque scenery. Additionally, nearby natural monuments like The King's Oak at Glücksburg Castle offer beautiful spots for relaxation and views.

How much time should I allocate for visiting Sønderborg Castle?

To fully experience Sønderborg Castle and its museum, including the historical rooms, Queen Dorothea's Chapel, and the various exhibitions, it is recommended to allocate at least 2-3 hours. This allows ample time to explore the different sections and engage with the interactive displays.

Is parking available at the castles?

Parking availability varies by castle. For Sønderborg Castle, there are parking options nearby in the town. For Nordborg Castle, parking is generally available for visitors accessing the grounds. It is always advisable to check specific parking information for each castle before your visit.

What is special about Augustenborg Palace?

Augustenborg Palace is the largest residential building in the region, a grand Baroque palace built from 1661. It's particularly known for its impressive Baroque castle church and extensive palace gardens, which are open to the public. The palace also houses a mini-museum in its gatehouse, detailing the history of the ducal family and the area.

Are the castles in Sønderborg accessible for visitors with disabilities?

While specific accessibility details can vary for each historical site, many modern museums and public areas within the castles, such as parts of Sønderborg Castle, strive to offer some level of accessibility. However, due to the historical nature of these buildings, some areas might have limitations. It is recommended to check with the individual castle's official website for detailed accessibility information prior to your visit.

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