#Area51 has spawned more conspiracy theories than perhaps any other military facility in the world. Here’s what we know (and don’t know) about this secret U.S. military installation. #BritannicaFile READ: What Is Known (and Not Known) About Area 51? — http://bit.ly/2Np21qJ ~~~ #EncyclopaediaBritannica Inspiring curiosity and the joy of learning since 1768. Web: https://britannica.com Facebook: https://facebook.com/Britannica Twitter: https://twitter.com/Britannica Instagram: https://instagram.com/Britannica