From Unknown, 1942.

We verified that there's a ghost on the walkway, plus the lights may be used to facilitate astral or time travel.  From Indiana University of Pennsylvania's 1985 yearbook.

From Kladderadatsch, 1920.

From Brigham Young Universe, 1949.

Use of the Dead to the Living, 1828.

The ultimate air guitar is played by ghosts.  This photo is exactly as it appears in Concordia's 1994 yearbook.

From The Bullet newspaper, 2009.  See Seance Parlor Feng Shui.

It's an enduring question: aliens or just a ghost?  From UFO Newsclipping Service, 1993.

We restored a grandfather clock that possesses a ghostly feature.  Thanks to Grumpy Andrew, of Grumpy Andrew's House of Horror, who said, "Wonderful! Oh that was a balm for my soul."  Meanwhile, to whatever pathetic soul thumbed-down our video, we'd ask to see what grand illusion you built from scratch this week, but —oh, that's right! — you didn't.  But you made us feel even more fabulous, so — lest we disappoint you — the thumbs-down didn't discourage at all but rather set us apart from you!  Thanks for social-distancing!  We feel safer now.

From Le Journal Amusant, 1929.

Here's a ghost haunting SUNY Plattsburgh's 1972 yearbook.

From Spellbound, 1977.  (Courtesy of Archive.org.)

A spirit photograph from State Teacher's College, Farmville, Va.'s 1934 yearbook.

From Spectral Tales #01 (1988).

From Duke's 1984 yearbook.  See Of Feeding & Caring For Sheet Ghosts.

The ghosts of light bulbs.  From Graphs: How to Make and Use Them by Herbert Arkin and Raymond Colton, 1940.