Many so-called ghost photos on the Internet are outright fakes created by accidental double exposure, lens flares, or pareidolia (seeing faces in objects). Yet every so often, you may come across a photo or two that can’t be so easily explained. Below are 21 of these still-unexplained photos, and they will chill you to the core. Could ghosts actually be real?

1. The fully uniformed ghost of a Gettysburg officer.

2. The Brown Lady.

3. Someone (or something) is locked in the school after hours.

4. The Man in White.

5. See the figure in the doorway?

6. This photo was taken in Manila. Something doesn’t want them to leave.

7. A spirit watching over someone.

8. The hand of a previous owner not ready to let their desk go.

9. Can you spot the ghost of a fully robed monk in this photo?

10. A ghostly restaurant indeed.

11. The realtor didn’t know what they were seeing when they took this photo.

12. The boy in the forest.

13. The ghost of the lighthouse keeper’s daughter.

14. This was taken at a hospital in Bolivia. See the figure in the elevator?

15. When you see the ghost in this picture, you’re going to scream.

16. The ghost of Freddy Jackson. Jackson was a fellow soldier who died just two days before his regiment’s picture was taken.

17. A disembodied foot at Christmastime.

18. A motion-triggered hunting camera captured the image of this little girl running through the woods. At the other end of the frame is what looks like a man following her.

19. All he wanted to do was show his wife his handiwork. Instead, he caught a ghost.

20. The face in the shadows…

21. The ghostly bridesmaid.

(via Movie Pilot, GhostsnGhouls)

I’m not sure why I always look at pictures of scary things right before bed, but these prove that I’m definitely not sleeping tonight. These ghosts look more real than anything I’ve ever seen before, and the fact that I cannot explain them terrifies me beyond belief.