Ancient Aliens: UFO Cover-Up Inside the U.S. Government (Season 5) | History

In 1952 cameras spotted UFOs flying over the White House lawn in Washington D.C. - these sightings eventually lead to Project Blue Book, created by the U.S. government, in this clip from Season 5, "Aliens and Cover-Ups."

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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