Strange round stones are being found in a mine in South Africa, they typically have 1 to 3 ridges around their circumference and predate the material surrounding them. Some say natural phenomena, out of place artifacts, or a sign that another form of intelligent life put them here.

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Team Sideways tackles the maddening mystery of how a jumbo jet loaded with hundreds of passengers could simply… vanish. Without a trace.

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Since the early 1980's, linoleum tiles have been found embedded in asphalt all around the world. They bear the inscription "TOYNBEE IDEA, IN MOViE `2001,RESURRECT DEAD, ON PLANET JUPITER". Their origins are unknown.

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The viking Ulfberht swords, made between 800-1000CE, were the most prized and advanced pieces of weaponry in the Viking arsenal. No one knows how the Vikings got them or who really made them.

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In April 1943 a woman's skeleton was discovered in a hole in a hollow tree in England; months later, mysterious graffiti began to appear which gave the corpse a name. The graffiti, and the investigation, continued for decades, but no one has ever identified the mysterious "Bella" in the Wych Elm… or her murderer.

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In August 2007, a severed foot in a running shoe washed up on a beach on the Salish Sea (in Canada). Since then, 12 more feet have been found. The likelihood of finding two feet in this situations is estimated at one in a million. Four of the feet have been identified, the rest belong to persons unknown. Why are these severed feet washing ashore in this location?

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In the summer of 1483 the 12 year old boy king of England, Edward V, and his 9 year old brother Richard, Duke of York, were moved into the Tower of London by their uncle the future king Richard III. The boys were never seen alive again. Bones were found in the Tower of London 200 years later that are believed to be theirs but the real question is what happened to them and whodunnit?

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The ghost ship Mary Celeste was found in December 1872 in the Atlantic Ocean west of Portugal, with her lifeboat gone and the crew missing. They had abandoned a perfectly seaworthy ship, and had apparently done so in a hurry, and left no sign as to why. They were never heard from again, and left behind one of the greatest mysteries of all time.

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December 18th, 1996, an unidentified woman commits suicide in the children's section of a cemetery. She leaves two $50 bills to "cover the cost of cremation". She was found on a clear plastic sheet, next to the sheet was an 8" Christmas tree, adorned with gold balls and red ribbons. All signs point to her perhaps being well off. Despite this, she has never been identified.

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The body of Elisa Lam was discovered in a water tank on the top of the Hotel Cecil in Los Angles on February 19th, 2013. How she got there, why she was there, and what happened to her in the days before her death are still unknown. The only thing that is known for sure is that she was alive on the 1st of February exhibiting unusual behavior. What happened to this girl?

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