The Museum Dungeons of the KGB is situated in the former regional KGB headquarters, also notoriously known as the Grey House. Some cells have been restored and some give an overview of the crimes of communist regime, Siberian prison camps and Estonian resistance movement.
You'll get a very genuine feeling of what it meant to be kept in those cells by the surrounding atmosphere. This the place to go, if you want to travel back in time.
The entrance is 2/1€.
Tu-Sa: 11:00-16:00