The building of the Naval Port Prison was built around 1900 and until 1997 it has served as a place where military persons served their terms for breach of discipline.
Mysterious and inexplicable things are noticed in the prison – rumbling footsteps, self-unscrewing of electrical bulbs, inexplicable opening of closed doors of the cells, but the appearance of seemingly impossible images in the hallways of the prison has come as an unpleasant surprise to many visitors.
In 2009 the ghosts of the Naval Port Prison were even chased by a sophisticatedly equipped team of professionals – “Ghost Hunters International”.  Sixteen ghost hunters spent a week in the prison looking for the White Lady and showed their work on the USA TV-channel “Sci-Fi”. They managed to both reveal the phenomena with help of their equipment and feel them themselves. One of the most possessed places in the world – was their conclusion.
The Naval Port Prison is not an ordinary museum. Tourists can experience a variety of shows – for instance, spend the “Extreme night” by stepping into the shoes of a prisoner. Or the VIP program – mind-blowing adventures in the Northern Forts with a possible arrest and interrogatory in the prison.
 
Guides are available in Latvian, English, German and Russian, price – Ls 2.50