The cold war nuclear bunker is near Broadway Tower, in south-east Worcestershire.
Broadway Tower can be seen behind this picture of one of the ventilation shafts.
The post is 20ft underground about 300 yards away from the base of Broadway Tower.
It was manned by the Royal Observer Corps during the cold war.
Their role would be to monitor where a bomb fell, the pressure of the bomb and the level of radiation.
There were numerous exercises during the cold war to test the observer's readiness.
The post was opened in June 1960 and closed in 1991 after it was felt there was no longer a threat from the Warsaw Pact countries.
There are only two rooms - the main observation area and a loo.
What are these?