The Citadel, located on Dover's Western Heights was constructed in the late 1700's as a port of defence during the Napoleonic war and has since been used for a variety of purposes.

Most recently it has been used as a borstal, prison and immigration detention centre up until its closure in 2015. Prior to that it was used as a barracks during both world wars. Given its rich history, this location features architecture from a wide range of time periods and a huge contrast between a modern prison and a forgotten wartime barracks.