Researchers believe they’ve discovered artificial structures on Mars, home to extraterrestrial civilizations, in this clip from Season 3, "Mysteries of Mars" Watch all new episodes of The UnXplained, Fridays at 8/7c, and stay up to date on all of your favorite The HISTORY Channel shows at ...

Scientists at Cornell University come across evidence of multiple advanced extraterrestrial civilizations after analyzing a map of the Milky Way, in this clip from Season 3, "Apocalypse When?" Watch all new episodes of The UnXplained, Fridays at 8/7c, and stay up to date on all of your ...