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Kastelholms slott
Getting around: About 25km northeast of Mariehamn, 25 minutes by car or seasonal bus.
Hours: Daily roughly 10:00-17:00 in summer; interior generally by guided tour; closed or exterior-only off-season.
Kastelholm is Aland's medieval castle, dating to the 14th century, serving historically as an administrative and royal residence under Swedish rule, now restored with guided tours through halls and courtyards — the most significant historic building in Aland.
Interior access is generally guided rather than free wandering, so timing matters more here than at more open sites.
Kastelholms slott FAQs
Need a guided tour?
Yes for the interior — check current tour times.
Open in winter?
No, full access is typically seasonal.
How far from Mariehamn?
About 25km, 25 minutes.
Combine with other sights?
Yes, Jan Karlsgarden is next door and Bomarsund is a short drive.
How old is it?
14th century, the most significant medieval structure on the islands.
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