Area 51
This from Wikipedia:
Area 51 is the common name of a highly classified United States Air Force facility within the Nevada Test and Training Range. A remote detachment administered by Edwards Air Force Base, the facility is officially called Homey Airport or Groom Lake. Details of its operations are not made public, but the USAF says that it is an open training range, and it is commonly thought to support the development and testing of experimental aircraft and weapons systems. The USAF and CIA acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft. The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component of unidentified flying object folklore. It has never been declared a secret base, but all research and occurrences in Area 51 are Top Secret/Sensitive Compartmented Information.
Of course, boomers like me believe it’s where the U.S. stores and studies the ETs captured or crashed on earth…
I remember when I took my dad to Area 51. It was a father son bonding experience. We hiked about a mile to reach the perimeter fence. I remember how freaked out he was when I went up to the guard house and knocked on the window. The windows were one-way glass. Pretty sure no one was there but who really knows? The best part was the look on my dad’s face. My personal opinion is that surviving ET’s have been pressed into service as guards… since you can’t see inside the guard houses.