Which US facility became a focus of many modern conspiracy theories due to its secretive nature?

Area 51 is the common name of a highly classified United States Air Force (USAF) facility located within the Nevada Test and Training Range. The facility is officially called Homey Airport (KXTA) or Groom Lake, named after the salt flat situated next to its airfield. Details of the facility's operations are not publicly known, but the USAF says that it is an open training range, and it most likely supports the development and testing of experimental aircraft and weapons systems. The USAF acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft.

Area 51 has become a focus of modern conspiracy theories due to its secretive nature and connection to classified aircraft research. Theories include:

• The storage, examination, and reverse engineering of crashed alien spacecraft, including material supposedly recovered at Roswell, the study of their occupants, and the manufacture of aircraft based on alien technology

• Meetings or joint undertakings with extraterrestrials

• The development of exotic energy weapons for the Strategic Defense Initiative (SDI) or other weapons programs

• The development of weather control

• The development of time travel and teleportation technology

• The development of exotic propulsion systems related to the Aurora Program

• Activities related to a shadowy one world government or the Majestic 12 organization.