Secrets of UFOs

It's a mysterious complex of buildings and runways that has been photographed by U.S. and Russian satellites and documented on the cover of Popular Science magazine. Until recently, the U.S. Government denied the very existence of Area 51. Signs authorizing the use of deadly force surround the base and unmarked helicopters are on constant patrol. What are they guarding?

On December 9, 1965, hundreds of witnesses saw an object crash in the woods near the small Pennsylvania town of Kecksburg. The military recovered the object saying it was a meteor and took it to an Air Force base. Local residents who saw the object up close disagree saying it was copper colored, acorn shaped and there was strange writing on the object. What really crashed at Kecksburg?

Crop circles have been reported around the globe for more than a century. They appear usually in complete darkness and often instantaneously. Some are clearly hoaxes. Others are inexplicable, with no evidence of human activity. This program asks questions like why do crops undergo changes at the cellular level and what are the strange lights seen over the fields where crop circles are found?