Devil's Den Soldier

Is this some patron who got lost on a tour, or is this an ages-old specter observing the events of the modern day from his ghostly vantage point?

The eerie image was taken by tourist Christopher Aitchison in May 2008 at Tantallon Castle east of Edinburgh. Aitchison has told newspapers that there was no one standing on the overlook when he snapped the picture.

The "person" appears to be wearing an old-style greenish ruff around the neck, a style congruent with old-style fashion.

Ghost?  Wayward tourist?  Costumed performer?  Trick of the light?  The decision is yours to make.