To this day, no one knows exactly what it was or why it was there. The only thing that is known is a mysterious cube-like object traveled over several parts of Missouri and thousands of eyewitnesses swear it was real. It's the bizarre event many in the state call the Missouri Cube Incident.
I tend to be a very skeptical person, but to me this is a blockbuster find by some urban explorers in Illinois. They captured video inside of an abandoned Kildeer, Illinois facility and uncovered what appears to be secret FBI papers talking about alien activity in that area.