From the outside, a cold war bunker in Kent may not look like an obvious contender to become an official part of England's heritage.
But delve below the surface and it's a whole different story. This historic corner of Gravesend was used as a control centre at a time when the threat of nuclear attack was still very real. David Johns went for a look around.
A bunker that has been given listed status by English Heritage would not have survived a nuclear attack.
The bunker would have been used between 1954 and 1968 in the case of a Soviet air attack.
The building would have handled information and coordinated the response to a nuclear attack.
A bunker in Kent has been given listed status by English Heritage today.
The bunker is a rare example of a purpose built civil defence centre, which would have been used in the case of a Soviet air attack.
The building would have been staffed by around 35 people and was in use between 1954 and 1968.
It has now been restored and is open to the public.