Area 51

The near-mythical Area 51 is a restricted U.S. military research area in the Nevada desert. Its existence was officially kept secret for decades and only confirmed by the CIA in 2013. Protected by motion sensors, a patrol of armed guards, and a no-fly zone through- out the entire site, it is no wonder that it is also surrounded by conspiracy theories. It is said to conceal an underground research facility where crashed spaceships and their (dead or alive) extraterrestrial crew are examined. The alleged aim is to gain access to advanced extraterrestrial technologies such as anti-gravity. This knowledge would then be used to develop and test new types of flying objects and weapons on-site.
The wild speculation about Area 51 encounters one problem: so far, the photos and so-called evidence of aliens and UFOs have all turned out to be fakes.