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File History’s Project Blue Book under must-watch
Vikings Recap: Ragnar swears revenge as he meets All His Angels
Hunting Hitler: Did Führer and Martin Bormann flee Berlin together after WWII?
Watch: Vikings behind the scenes of Season 4 and catch-up with Rollo
Ice Road Truckers: Watch as rivals team up to face treacherous crossing
World Detour: Jack plans perfect birthday trip for Ozzy Osbourne
Ancient Aliens recap: 21st century being built on extraterrestrial technology
Ancient Aliens: Roswell incident the tip of a conspiracy iceberg?
Alone on History: Contestant has breakdown in season finale