Crest, France
Crest dates way back in history, at one point in time it was a walled city, the Keep, or La Tour de Crest is all that remains of the walls and castle after Louis XIII ordered to have it all demolished. The Tour was kept after it was argued that it could be used as a prison.
La Tour has 900 years of history and was used as a prison for 300 years. It is really hard to get our Australian heads around numbers like that. It was used as a prison for longer than Austr...