This amazing photograph was taken at Bachelor's Grove in 1991 on an investigation by the Ghost Research Society using infrared film.
No living person was visible at the time, but the photograph clearly shows a human figure seated on the checkered monument near the south entrance.
The woman's face seems flat, with only a hint of a nose visible. Her feet blend into the grass (which appears white under infrared light), giving an appearance of translucence.
Since this photo was taken, the checkered monument has been photographed hundreds of times without producing anything nearly as spectacular.