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Historic sites

Suomenlinna Sea Fortress, Helsinki

Finland Uusimaa Helsinki

Suomenlinna Sea Fortress, Helsinki
Photo: Ximonic (Simo Räsänen), CC BY-SA 4.0, via Wikimedia Commons

An 18th-century fortress built across six islands at the entrance to Helsinki's harbour, a UNESCO World Heritage Site. Walk along the ramparts, past cannons and tunnels, visit the museums and a submarine from WWII, and picnic on the grassy walls by the sea. About 800 people live on the islands.


The public ferry from Market Square takes 15 minutes and runs all year on a normal transport ticket. Back in Helsinki, see the Lutheran Cathedral on Senate Square and the Temppeliaukio rock church.

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