The Ehrensvärd Society organizes guided tours of the Suomenlinna sea fortress in Helsinki.
With Johku, they sell public tours in Finnish, Swedish and English, group and school tours, tickets to the Suomenlinna Museum and the Ehrensvärd Museum, the historical music performance Malja Kustaalle, a mobile guide to the Suomenlinna shipwrecks, and books and souvenirs about Suomenlinna.