I think in the website are some historical facts about it, and it`s in english there also. I think it´s also mentioned in the book " The Commodore" that plays entirely in the baltic sea. Old name of the fortress was Viapori. There are lots of old big guns there, an old russian submarine....old buildings.
The building we will live in was part of the defense lines as a bastion. Where the windows are now, there were shooting holes.