They Spent The Night At THE MOST HAUNTED JAIL IN WALES (BEAUMARIS GAOL) That's Scary! Tonight these guys investigate whats said to be THE MOST HAUNTED JAIL IN WALES. Beaumaris Gaol. So much paranormal activity has been captured here and this location had been on their to do list for a very long time. Would thsy encounter anything unordinary?! Just watch the video below to see the scary footages and share this one also with your friends. Don’t forget to follow us also on Facebook!