• Ferry from Market Square runs every day of the year, about 15 minutes each way; buy tickets before boarding from the pier machines or the HSL app
• Blue Route is 1.5 km one way from the main pier to the King's Gate, so plan on 3 km of walking, with an easier-to-walk route running alongside it
• Visitor Centre at the pier is the first door on the left off the ferry, with a free map in nine languages and toilets in the ferry waiting area

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.