6. Really Close Encounters

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Is there life in outer space? Rob Riggle is on the case and heads to the Nevada desert, a UFO hotspot. He meets with an ex-CIA agent, Air Force pilots, a professional UFO hunter and a team of investigators.

5. Mysterious Disappearance

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Rob must find out what happened to Rome's 9th Legion, which vanished into thin air.

4. The Mystery of the O.K. Corral

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Rob Riggle talks about how this classic story is connected to the lost treasure of Skeleton Canyon.

3. Pirate Booty

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Rob's concocted a recipe to solve a 300-year-old pirate mystery in the Florida Keys.

2. The Holiest of Grails

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Rob follows in the footsteps of the Knights Templars, searching for the Holy Grail.

1. The Atlantis Case

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For centuries, experts and archeologists have tried to pinpoint the lost city of Atlantis, but all have failed. Now Rob Riggle is on the case, and Atlantis has nowhere left to hide.

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