6. Area 51
A top-secret military base, Area 51 is such a well-guarded secret that the government only recently admitted to its existence. Area 51 is protected by a no-fly zone and lots of other defenses the military doesn’t want you to know about.
The base’s current primary purpose is publicly unknown; however, based on historical evidence, it most likely supports the development and testing of experimental aircraft and weapons systems (black projects). The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component to unidentified flying object (UFO) folklore.
Although the base has never been declared a secret base, all research and occurrences in Area 51 are Top Secret/Sensitive Compartmented Information (TS/SCI). In July 2013, following an FOIA request filed in 2005, the CIA publicly acknowledged the existence of the base for the first time, declassifying documents detailing the history and purpose of Area 51.
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