There is a lot of very interesting literature in the folklore about ghosts caught on camera , I've seen a few and to be honest some of them are quite unexplainable. This video provides a good look at some of the classic Top 20 Real Ghost Photos.
Top 20 Real Ghost Photos
"A video collection of the top 20 ghost photos See more paranormal images at http://unexplained.co."
Have you ever caught a ghost on film?