Suomenlinna is a sea fortress and UNESCO World Heritage Site that is a lived-in district of about 800 residents. Its 80 hectares hold some 200 buildings, about 6 km of walls and over a hundred cannons.
The Blue Route runs about 1.5 km from the pink Jetty Barracks at the main pier to the King's Gate, passing the church lighthouse, the Great Courtyard and Finland's oldest dry dock.
