This photo was taken during an investigation of Bachelor's Grove Cemetery near Chicago by the Ghost Research Society(GRS). On August 10, 1991 several memeber of the GRS were at the cemetery, a small abandoned garveyard on the edge of the Rubio Woods Forest Preserve, near the suburb of Midlothian, Illinois. Reputed to be one of the most haunted cemeteries in the U.S., Bachelor's Grove has been the site of well over 100 different reports of strange phenomena, including apparitions, unexplained sights and sounds, and even glowing balls of light. When developed, this image emerged: what looks like a lonely looking young woman dressed in white sitting on a tombstone. Parts of her body her partially tranparent and the style of the dress seems to be out of date.
I'd explain it to you, but your brain would explode.