At 5:33 of the first part (GL 1x1), they show a picture describing an apparition, as they attempt to illustrate what was witnessed in the building...
I'll be damned, it's a picture of Bachelor's Grove. You can't miss the Patrick stone, nor the large V tree and the McKee stones, and the large dead tree right in front of the entrance by Moss.
It looks to be an older photo... It appears there's more stones in the picture, but it's unmistakable.