Sønderborg: The Complete Guide

Sønderborg, located in the southern part of Jutland, is a charming coastal town that offers a blend of modern amenities and scenic beauty. Visitors can enjoy strolling along the waterfront promenade, which provides lovely views of the Als Strait and the surrounding islands. The town has a lively centre with a good mix of shops, cafés, and restaurants serving fresh local seafood, making it a great spot for food lovers.

Cultural attractions in Sønderborg are diverse, including museums, galleries, and historic sites that add depth to the visitor experience. The Sønderborg Castle, now a museum, hosts exhibitions about the region and its maritime heritage. The town also has a vibrant arts scene with regular events, concerts, and festivals that reflect both traditional Danish culture and contemporary creativity.

Nature enthusiasts will find plenty to explore in the surrounding area of Sønderborg. The nearby beaches and coastal trails invite hiking, cycling, and water sports such as sailing and kayaking. With its mix of cultural charm and outdoor activities, Sønderborg is an appealing destination for those looking to enjoy both town life and nature in the Jutland region.

History of Sønderborg

Sønderborg in the Middle Ages

Sønderborg began as a strategic fortress town centered around Sønderborg Castle, built in the 12th century. The castle played a crucial role in regional conflicts and served as a defensive stronghold. During the Middle Ages, the town developed around the castle, growing as a trade and military hub with increasing importance in local politics.

Sønderborg in the Early Modern Period

In the 16th and 17th centuries, Sønderborg was often caught in the crossfire of wars between Denmark and neighboring powers. The castle was repeatedly besieged and rebuilt during this turbulent time. The town’s economy expanded through fishing, trade, and shipbuilding, while the castle transitioned from a purely military fortress to a royal residence.

Sønderborg in the 19th and 20th Centuries

The 19th century saw Sønderborg under Danish and later German control as part of the Schleswig-Holstein question, which deeply influenced the town’s identity and politics. After the reunification with Denmark in the 20th century, Sønderborg experienced modernization and growth, developing industries, infrastructure, and cultural institutions. The castle was converted into a museum, preserving the town’s rich history for future generations.

Sønderborg in the Contemporary Era

Today, Sønderborg is a vibrant town that balances its historical heritage with innovation and tourism. The castle museum attracts visitors interested in the town’s past, while modern developments in technology and education contribute to its economic vitality. Annual festivals and cultural events celebrate Sønderborg’s unique history and community spirit.

Visiting Sønderborg for the first time and wondering what are the top places to see in the city? In this complete guide, I share the best things to do in Sønderborg on the first visit. To help you plan your trip, I have also included an interactive map and practical tips for visiting!

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1. Sønderborg Castle

Sønderborg Castle is a striking Renaissance fortress located in the heart of Sønderborg, right on the waterfront. The castle now functions as a museum showcasing the history of the region, including exhibits on the wars between Denmark and Germany, local culture, and maritime heritage. Visitors can explore the well-preserved rooms, ramparts, and dungeons, as well as enjoy panoramic views of the harbor from the castle walls.
The museum is open daily from 10 AM to 4 PM, and entry costs around 80 DKK for adults, with discounts for children and seniors. It’s a must-see for history enthusiasts and those wanting a deep dive into Sønderborg’s past.

2. Dybbøl Banke Museum and Battlefield

Just a few kilometers from Sønderborg lies Dybbøl Banke, an important historical battlefield from the Second Schleswig War. The site features well-preserved trenches, bunkers, and a visitor centre with exhibitions that explain the 1864 conflict between Denmark and Prussia. There are also guided tours available that bring the history of the battle to life.
The museum is open from 10 AM to 5 PM during the summer months and until 4 PM in winter. Admission is approximately 75 DKK for adults and free for children under 18. The battlefield is surrounded by scenic walking paths perfect for reflection and exploration.

3. Alsion Concert Hall and Science Centre

Alsion is a modern cultural hub in Sønderborg that combines a concert hall, science centre, and university facilities. It hosts a variety of concerts, theatre performances, and scientific exhibitions throughout the year. The building itself is architecturally impressive and offers a range of events for both locals and tourists.
Tickets and opening hours vary depending on the event, but the centre is generally open during the day for exhibitions and evenings for performances. It’s a great place to experience contemporary culture and education in Sønderborg.

4. Sønderborg Harbour

The bustling harbour area is a vibrant spot to visit, with a mix of fishing boats, yachts, and ferries coming and going. The promenade around the harbour offers plenty of cafes and restaurants where visitors can enjoy fresh seafood with a view. It’s an excellent place for a leisurely stroll or to catch one of the local festivals held here during the summer.
The harbour area is open year-round, and many restaurants welcome guests throughout the day and evening. It’s ideal for soaking up the maritime atmosphere of the town.

5. Universe Science Park

Universe is an interactive science park located just outside Sønderborg, designed for visitors of all ages. It offers hands-on exhibits focused on technology, nature, and space exploration. The park includes outdoor activities, playgrounds, and a unique astronomical observatory. It’s both educational and entertaining, making it a favorite for families.
Universe is typically open from 10 AM to 5 PM during peak season, with tickets costing around 160 DKK for adults and 110 DKK for children. Booking ahead is recommended, especially in summer.

6. Gendarmstien Trail

The Gendarmstien is a scenic hiking and cycling trail that runs along the Danish-German border, with sections accessible from Sønderborg. It offers beautiful views of the coast, forests, and historic landmarks. The trail passes former border guard posts and military sites, providing a mix of nature and history.
The trail is open year-round and free to access, with varying distances depending on how far visitors choose to explore. It’s ideal for outdoor enthusiasts looking to experience the natural beauty surrounding Sønderborg.

7. Sønderborg Art Museum

Sønderborg Art Museum features a collection of contemporary Danish and international art, with rotating exhibitions throughout the year. The museum focuses on modern painting, sculpture, and graphic art, offering a diverse cultural experience. Its modern architecture and peaceful setting make it a pleasant place to spend a few hours.
The museum is open Tuesday to Sunday from 11 AM to 4 PM. Admission costs about 50 DKK for adults, with free entry for children and students. It’s a must-visit for art lovers.

8. Augustenborg Palace and Gardens

Located a few kilometers north of Sønderborg, Augustenborg Palace is an 18th-century royal residence surrounded by beautifully maintained gardens and parkland. Though the palace itself is not always open to the public, the gardens are accessible and perfect for walks, picnics, and enjoying the tranquil surroundings. The palace grounds often host cultural events during summer.
The gardens are open year-round with free access, while special tours inside the palace may be available seasonally.

9. Ulkebøl Church

Ulkebøl Church is a charming rural church located just outside Sønderborg. Known for its traditional Danish architecture and peaceful atmosphere, it provides insight into local religious heritage. The church often hosts concerts and cultural events that draw visitors from the region.
Visitors can explore the church during opening hours or attend special events. Entry is free, but donations are appreciated.

10. Broager Peninsula

The Broager Peninsula, located to the east of Sønderborg, offers idyllic countryside landscapes, quaint villages, and coastal views. It’s popular for cycling, hiking, and exploring small Danish towns with historic churches and local eateries. The peninsula is less touristy, providing a quieter experience of the region’s natural and cultural charm.
Open access year-round, the area is perfect for day trips and outdoor adventures near Sønderborg.