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Kastelholm Castle

Plizio editorial teamUpdated: Jun 2026Data Sources

Historical site

Weather…

Kastelholm Castle is the only medieval fortress in the Åland Islands and stands as one of the archipelago's most significant historical landmarks. First mentioned in records dating back to 1388, the castle originally served as a strategic outpost for controlling maritime routes in the Baltic Sea. During the era of Swedish dominance, it was a vital administrative hub, hosting prominent figures such as King Gustav Vasa in the 16th century. A somber episode in the castle's history occurred in 1571, when the deposed Swedish King Eric XIV and his wife Karin Månsdotter were imprisoned within its walls. The complex suffered multiple damages from fires and warfare, most notably a devastating blaze in 1745 that left much of the structure in ruins. In the 20th century, the castle underwent extensive restoration and now functions as a museum documenting medieval life and the political history of the Åland Islands. Situated picturesquely by a bay in the Sund municipality, it is part of a cultural complex that also includes the Jan Karlsgården open-air museum.

Location: Finland
Top sights: Björkens/Söderskog · Flyhagen/Knösäkern
Nearby: Jomala (7 km)

Best time to visit & climate

The most pleasant time to visit is Jul–Sep.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg °C	0	-1	0	4	8	13	17	17	13	8	5	2
Rain mm	53	40	38	36	42	58	58	65	60	70	68	62

📋 Practical info

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Visiting

Kastelholm Castle is a historic building on the Åland Islands, visitable both outside and inside. During summer months, guided tours are available through the restored rooms and inner courtyard.

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Typical hours

The castle typically opens only during the summer season (May to September) with daily hours. In the off-season, opening times are very limited or the castle is closed.

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Photography

Photography is allowed in most areas of the castle for personal use. Flash may be prohibited in some indoor rooms; the park and exterior grounds offer great subjects.

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Time needed

A visit to the castle usually takes 1-2 hours, including a guided tour of the interiors. If you also explore the surrounding grounds and open-air museum, allow 3 hours.

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Combine with

Combine the castle visit with a trip to the nearby open-air museum Jan Karlsgården. The surrounding Åland nature with hiking trails and coastal landscapes can also be easily added.

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Getting there

The castle is about 20 km northeast of Mariehamn, reachable by car or bike. Parking is available on site; bus services from Mariehamn run during the summer season.

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Insider tip

Visit the castle late in the morning to avoid the largest crowds. Look out for historical re-enactments and medieval festivals held during the summer.

Geography

Coordinates

60.21500, 19.95000

Facts

First documented in historical records in 1388
The only medieval stone castle in the Åland Islands
Prison for the deposed King Eric XIV in 1571
A major fire in 1745 left the castle in ruins for decades
Served as a regional administrative seat until the 1630s
Part of a cultural site including the Jan Karlsgården museum

Explore nearby

Notable places around

Jomala7 km · SExplore →

Finström7 km · NWExplore →

Saltvik9 km · NEExplore →

Hammarland11 km · WExplore →

Sund12 km · EExplore →

Mariehamn13 km · SExplore →

Bomarsund Fortress15 km · EExplore →

Lemland17 km · SEExplore →

Route planner — Car & Motorhome

Where do you start? We build the route here, with stops and country notes along the way.

Start Destination Via (optional)

Overnight stops

Vehicle

Only stops with (optional): 💧 Water ♻️ Disposal 🔌 Power 🚻 Toilets 🚿 Shower

Sights in the town Kastelholm Castle (2)

Björkens/Söderskog

Archaeological site in Åland, remains of a settlement or use.

Flyhagen/Knösäkern

Archaeological site in Åland, traces of historical land use.

Sights nearby

Frequently asked questions

Where is the castle located?

In Sund on the Åland Islands, located right by the water.

Are there combo tickets with other museums?

Yes, there are often tickets that also include the Vita Björn prison museum.

When was the castle built?

The first mention of the castle dates back to 1388.

Is photography allowed inside?

Yes, private photography without flash is usually allowed.

Are there guided tours?

Guided tours are offered regularly during the summer season.

Kastelholm Castle: where is it located?

Kastelholm Castle is located in Finland.

Kastelholm Castle: what is there to see?

Highlights include Björkens/Söderskog, Flyhagen/Knösäkern.

Kastelholm Castle: when is the best time to visit?

The most pleasant time to visit is Jul, Sep.

Kastelholm Castle: why is it worth visiting?

Kastelholm Castle is the only medieval fortress in the Åland Islands and stands as one of the archipelago's most significant historical landmarks.

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