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Ancient Aliens: Da Vinci's Alien Encounter (Season 4)

Could Leonardo da Vinci’s mysterious disappearance be evidence of an alien encounter? Uncover more in this clip from Season 4, "The Da Vinci Conspiracy." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite The HISTORY Channel shows at ...

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Ancient Aliens: Secret Symbols in the Mona Lisa (Season 4)

Ancient Astronaut Theorists believe there are hidden alien messages in Leonardo Da Vinci’s famous painting - The Mona Lisa. Discover more in this clip from Season 4, "The Da Vinci Conspiracy." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite ...

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