Places
Sights & landmarks
Suomenlinna Sea Fortress
A UNESCO-listed 18th-century sea fortress spread across six islands, a 15-minute ferry ride from Market Square.
Built by the Swedish crown in 1748 to guard against Russia, Suomenlinna is today a living district with around 800 residents, museums, cafés and grassy ramparts perfect for a picnic.
What to see
- King's Gate — the ceremonial entrance on the water
- Submarine Vesikko — a WWII sub you can climb inside
- Suomenlinna Museum — the story of the fortress
The HSL ferry is part of the regular public transport ticket (zone A).
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