Meramec Caverns Ghost Picture

Kwon Il Choi of Tulsa, Oklahoma sent us this ghost picture of a moving orb taken at Meramec Caverns, which many believe famous outlaw Jesse James used as a hide-out:
"This picture was taken inside Meramec Caverns, Stanton, Missouri (Date: Jan, 3rd 2007 Camera: Nikon L6). There was no source of light at my background, no water drops, etc. I've taken 20+ pictures in the cavern and this was the only one with the orb."