Inveraray Jail was in use as a prison and courthouse from 1820 to 1889. However, it is now a living museum and a category A listed building.
It is reputed to be haunted by a number of ghosts. These include that of a formidable jailer, who exudes a threatening demenour; and "dark figures" have been reported. Other unusual occurences include children seen talking to someone that the adults cannot see, and dogs behaving strangely.
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For further information, please read Haunted Britain by Richard Jones.