Throughout the Autumnal Spooky Season on Twitter, I noticed an odd trend. Questions like “why are there no dinosaur ghosts?”, “why do people never report seeing caveman ghosts?”, “why are there no ghosts older than Victorian times?”, and “how long do ghosts live?” seemed to keep cropping up online. With these kinds of questions buzzing around, I thought it would be interesting to see whether I could dig up some truly old ghosts. Ghosts that have been haunting us, not for hundreds, but for thousands, and even millions of years.