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(Image: SWNS.COM)

Bill Andrew, 78, was taking a photo of his family in front of the imposing castle when he noticed a ghostly apparition in one of in one of its doorways.

The eagle-eye pensioner insists the door was closed at Crathes Castle in Aberdeenshire during the visit.

He was visiting with his daughter Coleen Marsh, 60, granddaughter Jessica Hockley, 30, and great-grandson Findley Hockley, three, earlier this month.

(Image: SWNS.COM)

The stunned OAP said: "I has this reputation for being haunted.

"It did seem that something was standing in the doorway behind us.

"I'm not sure if it was a ghost or not and I'm not really clued up on the fact or fiction of the castle, but it's definitely something interesting."

(Image: SWNS.COM)

But James Henderson, the National Trust for Scotland property manager, reckons the spirit was that of the Green Lady.

Legend has it the Green Lady died suddenly in the castle after she poisoned her son's girlfriend.

Mr Henderson said: "There have been a number of mysterious sightings in and around the castle of late, in particular around Halloween, and the castle guides have reported that things have felt strange.

"They have reported a chill down the back in an otherwise warm room, odd noises in an otherwise empty building.

"Could this photograph be related to this? Or, perhaps it is a sighting of the Green Lady."