The most infamous UFO sighting took place in Roswell, New Mexico in 1947.
According to eye witnesses, a UFO fell to earth and an alien was discovered alive by the U.S government and taken away to experiment on.
Here, Major Jesse Marcel from the Roswell Army Air Field is pictured with debris found 75 miles north west of Roswell, NM, in June 1947.The Government identified the debris as that of a radar target but conspiracy theorists claim that the evidence was removed and replaced.
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(Photo by: UNITED STATES AIR FORCE/AFP/Getty Images)
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