The Farla said the deeds of the detached house dated from 230 years ago and they believe that at some point it had been used as a pub.
Richard Westwood Brookes, historical documents expert for nearby Shropshire auctioneers Mullocks, said: 'If the deeds are over 230 years old and the room dates back to the 1700's, there's a chance it could have been used as a Catholic hideaway or for other nonconformist religious groups.
'There's a possibility a room like that could be used as a clandestine Catholic church as you couldn't be a Catholic during that time - you would be persecuted and executed.
'It may well have been a Catholic priest hole - but it all depends on what the age was.'
He added that if it had been built during World War II it could have been a type of bunker.
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