The history of UFO sightings in North America goes back nearly 80 years. Explore the timeline of some of the most famous sightings and listen to testimonials from witnesses and the experts who dedicate their careers into uncovering the mysteries behind them. Solve the unknown in the brand new series, UFOs: Investigating The Unknown, Tuesdays at 8pm on National Geographic UK. | National Geographic UK

This is the only video in existence of a crop circle being created. In 1996 at Oliver’s Castle in Wiltshire, a video was taken of 2 balls or light, or orbs, circling around an area in a field as the impressions of the crop circle appear on the ground. Critics claim is edited video, but animation experts say that video would have taken days to make with the tools of that time. The crazy thing is, I have seen a ball of light that looked JUST like that, but it was broad daylight on a fairly busy ro