STOMP it anytime, anywhere.
Download the new STOMP app today.
When it comes to unsolved mysteries, they don't get much creepier than this.
Acid Cow has compiled a series of photographs documenting occurrences from the past mankind has not found explanations for.
Some of them are so bizarre that you will be left wondering why no horror movie has been made about them yet.
Have a look at them in the gallery.