Shepton Mallet Prison was once home to some truly hardened criminals including child killers, rapists and notorious gangsters.
Its inmates included the Kray Twins, who were moved there from the Tower of London, among many other feared offenders.
Before closing in 2013 the penitentiary, which is an hour's drive from Bristol, was the oldest operating prison in the country and held a total of 189 high-risk prisoners at its peak.
For this reason and others it is said to be one of the most haunted in the UK - and people can find this out for themselves first-hand, as the prison allows thrill-seekers to roam its corridors.
Exploring Shepton Mallet Prison
The tours have proved hugely popular since being launched and there's a string of new dates coming up which will give people a horrific insight into prison life.
Brave souls will be able to explore the terrifying building, supplied with snacks and ghost-hunting equipment, before staying the night in one of the cells.
With links back to the early 17th century and with so many thousands of victims that lie within the grounds, it is not a place you would ever want to be alone.
Cell doors are regularly heard opening and slamming shut for no reason, footsteps are heard on the walkways and along the corridors and ghostly figures are also seen moving around the prison in the dead of night.
Someone who works for tour organisers Bump In The Night said: "Since I started working for Bump In The Night I've been on quite a few night-time tours of the prison and they really are terrifying.
"I wasn't convinced it would be that scary before my first one but that has definitely changed now. I've seen and heard all sorts including shadows when nobody is around, doors slamming shut and footsteps only to see nobody there.
"When we were in the prison once my colleague leapt up from his seat and ran across the room. I asked what happened and he said he heard a loud growling sound in his ear, but we were the only two people in there."
Don't forget not only will you have to put up with sharing the space with ghosts of former inmates, you'll also be sleeping on a very uncomfortable bed during your stay.
Booking your space
Sadly the Halloween sleepover date on October 24 has sold out, but there are opportunities further in the future to explore the prison at night-time.
The below dates all have spaces:
- Friday, December 20
- Friday, January 17
- Friday, January 24
- Saturday, February 8
- Friday, February 14
For more information and to book, visit Bump In The Night's website.
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