Ghosts have been haunting people all over the world for centuries. But why do they persist in this age of reason? Mike Williams explores the fear and fascination ghosts produce and finds out how our reaction to apparitions has changed over the years.

We join a group of ghost hunters in England on a spooktacular tour of a derelict orphanage; Mike meets the cultural historian Dr Shane McCorristine in the birthplace of the Victorian ghost story; and the psychologist Professor Christopher French explains the mind’s capacity to produce hallucinations.

(Image of a ghostly woman standing by the window. Credit: Shutterstock)