Look at Suomenlinna-Sveaborg is the tourist's guide to one of the world's largest sea fortresses. The book includes presentations of the larger fortress islands with their main sights and sums up the highlights and the main events of the 270 years long history of the fortress. The book also includes a glossary of fortification terms.
Look at Suomenlinna-Sveaborg. The Island Fortress off Helsinki. Olof af Hällström (third updated edition, rev. Magdalena af Hällström). Aquarelles by Päivi Paunu. (2010)