The Adelaide Gaol was built in 1841 and housed approximately 300,000 prisoners during its 147 years of operation.
The Gaol closed it's doors to prisoners in 1988, but then opened them again as a popular tourist destination. Up to it's closing, the jail was known as the longest continuously operating prison in Australia.
Over the years, there were 45 people hung at the prison, including one woman.
It would have been a a terrifying place to be incarcerated and it seems that many of the previous inmates have never really left.
Many paranormal investigators have visited the Gaol and there's been a lot of documented ghost activity - they include seeing full body apparitions, hearing disembodied voices and experiencing cold spots.