Were alien secrets hidden in Roswell and Area 51? 'Project Blue Book' UFO hunters investigate.

Two locations are legendary among UFO seekers. One is Roswell, New Mexico, where sightings of a so-called flying saucer electrified the town in 1947. The other is Area 51 near Groom Lake, Nevada, where the U.S. government has long maintained a secret base that some say hides UFO-related technology and experiments.

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