People are both scared and intrigued by ghosts.  Suffice it to say ghosts are very popular with the general public.  They are frightening, yet they allow belief in the afterlife. The idea of ghosts has been around since time immemorial. 

The belief in manifestations of the spirits of the dead is widespread, dating back to animism or ancestor worship in pre-literate cultures. Certain religious practices—funeral rites, exorcisms, and some practices of spiritualism and ritual magic—are specifically designed to rest the spirits of the dead. Ghosts are generally described as solitary essences that haunt particular locations, objects, or people they were associated with in life, though stories of phantom armies, ghost trains, phantom ships, and even ghost animals have also been recounted.

With the advent of film the ghost story had a new platform that made the popular genre more accessible. There are many ghost movies. Below are a few, many others are out there.