We asked the BuzzFeed Community to tell us which unsolved mystery always freaks them out. Here are the spine-tingling results.
1. The Toxic Lady
2. The Watcher House
3. The Disappearance of Nicholas Barclay / The Impostor
4. Mr. Cruel
5. The Circleville Letter Writer
6. Number Stations
7. The Disappearance of the Beaumont Children
8. Brown Mountain Lights
9. West Memphis Three
10. The Death of Max Spiers
11. Missing Malaysia Airlines Flight 370
12. Mikelle Biggs
13. The Oak Island Mystery
14. Cindy James
15. The Disappearance of Brian Shaffer
16. D.B. Cooper
17. And the Children who Went Up In Smoke
Submissions have been edited for length and/or clarity.