Here are some classic ghost photos. Click to enlarge.
Eastry Church in Kent in 1956. There was no one in the pew at the time.
I guess ghosts like to party, too.
This photo was taken in a cemetary. Nobody was sitting on that bench when the photo was taken. This is one of the sadder ghost photos I've ever seen. Is it the ghost of someone buried there? Or are they waiting for someone to arrive?