Area 51 is a highly secretive military installation located in the Nevada desert, USA.
It was officially established in 1955 by the US Air Force as a testing and development facility for experimental aircraft.
The area surrounding Area 51 is known as the "Nevada Test and Training Range" and covers approximately 4,687 square kilometers.
The facility is believed to be involved in the development and testing of advanced aircraft and weapon systems, including stealth technology.
Area 51 gained widespread attention and notoriety in the 1980s due to claims of UFO sightings and extraterrestrial activity.
The US government did not publicly acknowledge the existence of Area 51 until 2013, when the CIA released declassified documents confirming its existence and purpose.
Access to Area 51 is heavily restricted and the area is patrolled by armed guards.
The facility has its own airfield, known as Groom Lake, which is used for testing experimental aircraft.
Area 51 has been the subject of numerous conspiracy theories, including claims that the US government is hiding evidence of extraterrestrial life.