Ancient Aliens
Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.

Season 13 · Episode 2 ·
Da Vinci's Forbidden Codes
Researchers claim there are hidden messages that can be found within the works of Leonardo da Vinci--and other art throughout history--that may reveal an extraterrestrial influence.
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Episode 2 of season 13 of Ancient Aliens: “Da Vinci's Forbidden Codes”. Aired 2018-05-04. Watch it online free on ZapFlix.