A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
In 1958, a nuclear bomb was lost somewhere along the swampy coast of Georgia. Its whereabouts remain a mystery to this day.
29
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
There is an island near Italy that was the site of wars, a dumping ground for plague victims, and an insane asylum. It's considered so dangerously haunted that the Italian government does not allow public access.
78