UVB-76 Straight out of a spy novel comes this mysterious Russian radio transmission. Every few years comes a mysterious coded message. You can hear audio clips on both links. Apparently this transmission has been active for 30 years, and rarely a spoken message appears. The last message was broad...(more)
I thought I would start things off with my most upvoted answer thus far. It is essentially a consolidated version of the Wikipedia article regarding the mystery of The Somerton Man. Well worth a read, and an upvote, if I may say so myself.