There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
23
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
In 1958, a nuclear bomb was lost somewhere along the swampy coast of Georgia. Its whereabouts remain a mystery to this day.
29
The Platypus used to be considered a myth like Bigfoot and the Yeti.
18