Since 1982, a radio frequency emanating from Russia has been broadcasting a buzzer-like sound and, periodically, an unknown voice reads orders, names, and numbers. No one knows where exactly it is coming from or what it means.
13
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
The Platypus used to be considered a myth like Bigfoot and the Yeti.
18
There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
23