Opening hours and events
European Fortress Day 2019
European Fortress Day is celebrated in many fortresses around Europe in September. Visitors have a chance to take part in events, open doors and guided tours and hear more about history and life today in European fortresses.
Event in Suomenlinna Sea Fortress will take place on Thurdsday 5 September and detailed programme will be introduced by the beginning of August on this page.
Suomenlinna Sea Fortress and history
Situated on a group of islands off Helsinki, Suomenlinna was built during the Swedish era as a maritime fortress and a base for the Archipelago Fleet. Work on the fortress began in 1748. The active phase of the Viapori fortification work ended just over 40 years after it began.