For decades the mystery that has shrouded Area 51 has led to some of the most bizarre conspiracy theories out there. Is it where the remnants of a possible crashed alien spacecraft from Roswell, New Mexico being housed? Has the government mastered time travel in an underground lair? Is there really an invisible runway that can only be detected when sprayed with water? Hundreds of eyewitnesses claim to have seen UFO's flying in the airspace above the military base. But were those just black project spy planes? Or is the truth really out there and can be found in the Nevada desert?