Crop Circles, sometimes referred to as Crop Formations as they are not always circular, are very larges patterns in fields. They are created when crops, such as wheat, barley, etc., are flattened.
Crop Circles are believed to be Extraterrestrial in origin. Some believe that Crop Circles are a means of communication from aliens, and some believe that they are the sites of UFO landings.
In the last 100 years there have been over 10,000 crop circles discovered worldwide.