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

Delving into the Mysteries of the Fields: Crop Circles, Earth’s Enigmatic Patterns. Since their surge in popularity in the late 1970s, these intricate designs have been mystifying observers. Often appearing overnight, these complex formations range from simple circles to elaborate patterns. Are they messages from another world, natural phenomena, or intricate hoaxes? This enigma continues to captivate and puzzle researchers and enthusiasts alike. #CropCircleMystery #FieldArt #UnexplainedPhenomen