People have been speculating about Area 51 for seven decades.
In the mid-50s, during the height of the Cold War, the United States government began testing ultra-high altitude U-2 jets in the desert of Southern Nevada at an airbase known as Area 51.
These jets flew in ways that were shocking to most local residents and many began reporting UFO sightings. The U.S. Air Force kept mum about the U-2 and explained the sightings away as "natural phenomena" or "high-altitude weather research."
These events have led to decades of speculation and conspiracies about what actually has been going down at Area 51 and why the government is intensely secret about the base.
The government didn't even publicly acknowledge its existence until a 2005 freedom of information act request was released in 2013.
Some believe that Area 51 is where aliens and their spacecraft were taken after the 1947 Roswell incident.
Others claim that Area 51 is a meeting ground where the government holds secret communications with extraterrestrials.