While the government doesn't officially acknowledge the existence of Area 51, it remains a lightning rod for controversy and speculation. This installment of A&E's "History's Mysteries" series explores the stories and suspcions that swirl around the mysterious base, from the fears of conspiracy theorists that it's ground zero for a shadow government to the long-rumored presence of UFOs and alien remains.

The bastion of some of the most top-secret activities in the world, Area 51 is literally impenetrable. It was the original testing site for the atomic bomb and then a high-security aero-engineering cluster. But here its public history ends: after 1968, it simply does not exist.

Known by insiders as "Dreamland," Area 51 invokes conjectural theories like no other place: Is it a UFO project, a medical testing site, a New World Order? What happens in this zone of the Nevada desert - and why must it be so clandestine? Through declassified documents and interviews with tenacious researchers and former workers, including Bob Lazar, The History Channel takes viewers deep into the mystery that envelops Area 51.

"Dreamland" might forever remain enigmatic, but Area 51: Beyond Top Secret offers a riveting investigation into the history, the possibilities, and the bizarre events that surround the military's best kept secret.