Area 51

The United States Air Force facility commonly known as AREA 51 is a remote detachment of Edwards Air Force Base.The base's current primary purpose is publicly unknown; however, based on historical evidence, it most likely supports development and testing of experimental aircraft and weapons systems.The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component to unidentified flying object (UFO) folklore.Although the base has never been declared a secret base, all research and occurrings in Area 51 are Top Secret/Sensitive Compartmented Information.
SOME OF THE ACTIVITIES THAT MAKE A ROOM FOR THE CONSPIRACY THEORIES ARE-

• The development of time travel and teleportation technology.
• The development of unusual and exotic propulsion systems related to the Aurora Program.Aurora was a rumored mid-1980s American reconnaissance aircraft. There is no substantial evidence that it was ever built or flown and it has been termed a MYTH.
• MEETINGS OR JOINT UNDERTAKINGS WITH EXTRA TERRESTRIALS.

Several people have claimed knowledge of events that stimulate these conspiracy theories further-

• Bob Lazar, who claimed in 1989 that he had worked at Area 51's "Sector Four (S-4)", said to be located underground inside the Papoose Range near Papoose Lake has stated he was contracted to work with alien spacecraft that the U.S. government had in its possession.
• Bruce Burgess

Similarly, the 1996 documentary Dreamland directed by Bruce Burgess included an interview with a 71-year-old mechanical engineer who claimed to be a former employee at Area 51 during the 1950s. His claims included that he had worked on a "flying disc simulator" which had been based on a disc originating from a crashed extraterrestrial craft and was used to train US Pilots. 

He also claimed to have worked with an extraterrestrial being named "J-Rod" and described as a "telepathic translator".

A conspiracy about humans communicating with the extra terrestrials, popularly called "ALIENS" makes Area 51 a bizarre place. By now we have certain knowledge about the happenings over there but concrete evidences with explanations are required to answer our curiosity..and to answer a very important question of this century---"DO ALIENS EXIST?"

(source: Wikipedia)