Here is that famous picture from 1991 of the Bachelors Grove woman.
The Madonna of Bachelor's Grove
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 members of of the GRS were at the cemetery, a small, abandoned graveyard 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.
GRS member Judy Huff was taking black and white photos with a high-speed infrared camera in an area where the group had experienced some anomalies with their ghost-hunting equipment. The cemetery was empty, except for the GRS members. When developed, this image emerged: what looks like a lonely-looking young woman dressed in white sitting on a tombstone. Parts of her body are partially transparent and the style of the dress seems to be out of date.
Here is Judy's first Radio Interview on Thresholds Radio with John Stephenson: http://ufo-info.com/show/9302012/ (http://ufo-info.com/show/9302012/)
Here is a quote from the book "The Ghost Hunter's Guidebook" (https://www.prairieghosts.com/guidebook.html) By Troy Taylor about this picture:
I received a copy of this photo and had it examined by several independent photographers. Most of them would have liked to come up with a reason why the photo could not be real, but unfortunately they couldn't. They ruled out the idea of a double exposure and also the theory that the person in the photo was a living woman who was placed in the photo and made to appear like she was a ghost. One skeptic also claimed that the woman in the photo was casting a shadow. but according to the photographers who analyzed the image, the "shadow" is actually nothing more the natural shading of the landscape. Besides that, one of them asked, if she is casting a shadow in that direction, then why isn't anything else in the frame doing the same?Photo by Judy Huff-Felz
(http://www.bachelors-grove.com/bglady.jpg)