Sea Fortress Suomenlinna, Helsinki

4.4
#1 of 1,724 in Things to do in Finland
Must see · World heritage site · Castle · Military Facility
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
© OpenMapTiles © OpenStreetMap contributors

Sea Fortress Suomenlinna reviews

Rate this attraction
TripAdvisor traveler rating
TripAdvisor traveler rating 4.5
8,133 reviews
TripAdvisor
  • A special hint if you play Pokemon Go: a lot of rare Pokemons on the island. Also, has all the qualities of a great day trip destination: swimming, history, good resturants, picnic if you want, small....  more »
  • We had a pleasant day trip to Suomenlinna. This was our school assignment, and we chose to visit the Sea Fortress as a visit&observe task. On the day we visited the attraction, the weather was pretty....  more »

Plan your trip to Helsinki

  • Get a personalized trip
    A complete day by day itinerary
    based on your preferences
  • Customize it
    Refine your trip. 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.