There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
23
Scientists lit a cave of natural gas on fire in 1971 expecting it to only burn for a few days; it still burns to this day. It has been nicknamed "The Door to Hell".
19
There is a 600 year old 240 paged book called the Voynich Manuscript, that’s written language is still completely unknown today.
15
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 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