Sea Fortress Suomenlinna, Helsinki

4.4
#1 of 1,726 in Things to do in Finland
Visit World Heritage Site Sea Fortress Suomenlinna to see a sea fortress built on a collection of six islands. This ruggedly beautiful spot is a favorite among both locals and tourists. The fortress was built in 1748 and inhabited by Swedes and Russians until 1918, when it became a part of independent Finland. View the impressive fortified structure, constructed by the Swedish crown to withstand attacks from 18th-century Russia (who eventually overtook the islands in 1808). Nowadays the site supports a town with civilian inhabitants and draws visitors from the mainland of Finland. For travelers who use our online itinerary creator, Helsinki holidays become easier to arrange, with trips to the Sea Fortress Suomenlinna and other attractions mapped out and timetabled.
Create an itinerary including Sea Fortress Suomenlinna
map
© OpenMapTiles © OpenStreetMap contributors
Tours to Sea Fortress Suomenlinna
Sea Fortress Suomenlinna Reviews
Rate this attraction
TripAdvisor Traveler Rating
TripAdvisor Traveler Rating 4.5
7,988 reviews
TripAdvisor
  • Its a UNESCO heritage place. Very nice. However, too cold in winter. Very good place for Summer. Its a must visit when someone in Helsinki  more »
  • Helsinki is really quite a relatively small capital city if you happen to come from a large city like London and there are, to be honest, not that many tourist sights to see. And they also happen to b...  more »
Places to stay near Sea Fortress Suomenlinna

Plan your trip to Helsinki

  • Get a personalized plan

    A complete day-by-day itinerary
    based on your preferences
  • Customize it

    Refine your plan. We'll find the
    best routes and schedules
  • Book it

    Choose from the best hotels
    and activities. Up to 50% off
  • Manage it

    Everything in one place.
    Everyone on the same page.

Popular things to do in Helsinki

View all >
4.2
Duration: 1​h 30​min
4.3
Duration: 1​h 30​min
4.4
Duration: 1​h 30​min
4.3
Duration: 1​h 30​min

Hidden gems in Helsinki

4.8
Duration: 1​h 30​min
3.9
Duration: 8​h
4.0
Duration: 1​h 30​min

Museums in Helsinki

View all >
4.2
Duration: 1​h 30​min
4.2
Duration: 1​h 30​min
3.8
Duration: 1​h 30​min
4.8
Duration: 1​h 30​min

Side trips from Helsinki

4.7
Duration: 8​h
5.0
Duration: 8​h
5.0
Duration: 4​h
5.0
Duration: 2​h 30​min

Shopping in Helsinki

View all >
4.2
Duration: 1​h 30​min
3.5
Duration: 1​h 30​min
5.0
Duration: 1​h 30​min
4.2
Duration: 1​h 30​min

Nearby attractions in Helsinki

3.7
Duration: 30​min
4.9
Duration: 2​h 30​min
3.9
Duration: 1​h 30​min
4.9
Duration: 1​h 30​min
4.5
Duration: 2​h
4.4
Duration: 1​h 30​min
4.4
Duration: 2​h 30​min
4.3
Duration: 30​min