From a spooky face in the background to spectral figures looming on the edge of images, there are countless examples of "ghosts" being captured on film or in digital photographs.
But rather than being evidence of unearthly presences, they have more to do with how cameras work.
To capture an image of a ghost for yourself, all you need is a little knowledge about how cameras work. Or just be in the right time and in the right place.
Check out this video to discover more, and then read this article for the full story.