The museum of the Bulgarian navy. Shown is the torpedo-boat "Druzki". More historical information on this boat is available in bulgarian here: http://varna.info.bg/1912.htm
For more information on "Druzki", please check the Wikipedia also: http://en.wikipedia.org/wiki/Drazki
For more inforamtion on torpedo boats in general, please click on this link: http://en.wikipedia.org/wiki/Torpedo_boat