Area 51 Conspiracy:
Area 51 is a secret US military base and host of the world’s most controversial conspiracy theory about existence of Aliens and that an Alien spacecraft (UFO) crashed near Roswell, New Mexico on July 2, 1947 and bodies of aliens were found near the place of incident. United States government confiscated the material for later study and the world was led to believe that the debris recovered from the crashed alien spacecraft was that of a crashed weather balloon.
Some theories report that the United states government transported the debris material recovered from the crashed alien spacecraft to nearby air force base in Roswell. Other theories says that the spacecraft debris was transported to Area 51, a secret military base in Nevada. The government took the alien bodies to Area 51 and autopsies were performed on dead alien bodies. After the incident, people who tried to uncover the truth were visited by military personnel, known as Men in Black, and were threatened to not disclose any information to investigators.