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With thousands of UFOs sightings worldwide every year, can our alien experiences really all be put down to imagination? Alex Podovich of Las Vegas UFO Hunters travels to the Extra-terrestrial Highway in Nevada and Peter Merlin visits a supposed crash site in search of evidence of what happened.

Watch the full National Geographic - The Truth Behind UFOs movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.