Six weeks after the JFK assassination, a KGB agent who had been working for the CIA defected to the US, claiming to have information about Lee Harvey Oswald. Yuri Nosenko's defection eventually led to purges in the CIA and still haunts the agency, with allegations of cover-ups of information relating to the assassination, and hints at the possibility of a mole in US intelligence.

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A discovery that "changes everything", Gobekli Tepe is a prolific discovery and dates to a time when humans were literally mere decades from being cavemen. Who built these, how did they build them, why did they build them... even to the experts, there are far more questions than answers on this one.

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A new arcade game arrived in Portland in 1981 but was pulled from arcades just weeks after it arrived. It's never been seen again. Was it having strange effects on the kids who play it? Was it a government test? Is it just an urban legend?

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In February 1942, the Free French Navy submarine Surcouf departed Bermuda for Australia, via the Panama Canal. She never reached the canal, and disappeared without a trace, leading to accusations of conspiracy and betrayal, along with the usual Bermuda Triangle angle.

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One mystery has plagued us since childhood- how does he carry all those toys? How does he make it to everyone's house in one night? Why has no one seen him delivering toys? That's right, it's Santa! We take a look at the tough questions, and this time, we may have actually solved it!

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Bagdahd, Iraq, 1939, a new curator takes over the National Museum of Iraq, bringing to light a confusing discovery- a ceramic pot with a metallic rod inside. Speculation over what this artifact is, what it was used for, and why it produces electricity has run rampant ever since.

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A near-earth-object that was seemingly metallic and approximately 10 meters across went past the earth in 1991. Instead of looking like a piece of space rock it showed characteristics of a "made" object. It looks like it could have been made by an intelligent species, did we send it or did someone else?

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In November 1970, the partially burned corpse of a woman was discovered near Bergen, Norway, leading to one of the most intensive investigations in Norwegian history, which is still a source of controversy to this day, with allegations of espionage and cover-ups.

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In Philadelphia on February 25th, 1957 a would-be peeping tom discovers a box with the body of a young boy in it. The boy has never been identified, despite diligent work from many different organizations. Who was this boy, and why was he killed?

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In post WWII Germany the Colorado potato beetle began decimating crops. No one knows why they appeared in such great numbers that season. Did the US dropped them there as a form of biological warfare, did they just happen to accidentally invade, or was it someone else?

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