Spirit photography was all the rage in the 19th century. Long before Photoshop, photographers would use double exposures as a way to add ghosts to their pictures. Some of these photographers were honest about their technique and David Brewster even wrote a book about how to add a ghost to a picture. Others, like William Hope and William H. Mumler, made a fortune by conning the bereaved and promising to prove that the spirits of their loved ones were still with them.
Here are some spirit photographs from the 19th century:










