Diane Barron, 46, from Norwich, Norfolk, snapped the eerie spirit leaning with two hands on the wall of the bridge at National Heritage site Oxburgh Hall.
Covered in misty black robes, the ghoul appears less than a meter away from another visitor who was oblivious by her close-encounter.
Mrs Barron was on a trip to the medieval family home built for courtier Sir Edmund Bedingfield in 1482.
Eagle-eyed Mrs Barron, only spotted the unusual figure when reviewing her pictures and is certain it must be a spirit.
Previous online reports claim the figure of a cloaked woman haunts the grounds of Oxburgh Hall, after she mysteriously went missing three-hundred-years-ago.
Despite differing beliefs on what the picture could be online, Diane adamantly maintains that she did not edit her picture and that there was a dark figure on the bridge.
Mrs Barron, a customer advisor, said: “It was just a normal day, sunny with some clouds, we’d used our national trust cards to visit the hall.
“I took several pictures and there were no special events on at the hall on the day.
“It wasn’t until later that I saw there was a dark figure on the bridge at the hall.
“When I first took the picture I didn’t realise I had taken anything unusual but when I enlarged the picture and zoomed in it gave the chills and friends have looked at it too who have felt the same.
“At first I thought it was someone who was out of focus but as you can see people nearby are in focus
“I enlarged the photo and sent it to several Facebook groups – there have been mixed reactions, some people thought it was someone in fancy dress, others thought it was a mark on the wall.
“But if you check pictures from the hall on Oxburgh Hall, there is no mark against the wall near the bridge.
“I can only go from the photo I took and it was not altered in any way and had not set out to change the photo.”
Varying reports have surfaced in the past about hauntings at the location.
Medium Ian Griffiths who reads psychic meaning from photographs supports the belief that the spirit could be a woman who went missing.
He said: “My guide tells me there’s definitely a ghost spirit there.
“I feel it’s a young woman around the age of 23-years-old with long, dark brown hair who was very pretty looking.
“I feel she was around eight months pregnant and was drowned, it was something to do with struggling under the water.
“She was not married, her father worked with the Kings’ horses and she’s been seen on some stairs inside the castle.”