Area 51
In 1947 claims that an "alien spacecraft" had landed in Roswell, New Mexico, were dismissed by the US military, which said the alien craft was merely a weather balloon.
Ufologists believe the spacecraft was taken into Area 51 – a division of Edwards Air Force Base – and the US government has been researching alien technology and life forms on the site ever since.
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Video footage of an alleged "alien autopsy" has been shown to be fake, but Area 51 is known to be a secretive and heavily guarded base.
The reasons, however, may be more earthly than the conspiracy theories suggest: the U-2 spy plane, and several other top-secret aircraft, were developed and tested here.