WWII Museum Submarine 'Vesikko', fully restored, though now on dry land. A fascinating peek into the war and the pre-war Finnish submarine design that was even bought by the German navy in the 1930s.
Suomenlinna (WWII Museum Submarine 'Vesikko') 00190 Helsinki Finland
Only open during summer!
Ask if you can have a look at the conn tower.
Nice but small submarine.
Из 5 подводных лодок , которыми располагала Финляндия, во время второй мировой войны, «Весикко» единственная сохранившейся. Лодка принимала участие в боевых действиях и потопила один надводный корабль
Must always visit military museums :) - Morten Aastad
Interesting museum documenting the island's history. - Carl Griffin
Excellent section on the pre-history of Finland with great English descriptions of stone, bronze and Iron Age artefacts. Good section on the third floor for the kids including building a wood hut. - Fred Spofforth
Definitely worth a visit even if you're not into the museums, it's a really nice day trip just to walk around the area - Kai-En Loh
This is a very nice place, perfect to stop by during your trip in this special island! You feel like a home, with a nice and good soup and self service water and bread! - Manuel Incerti