Crop circles are an unexplained phenomena that sparks a lot of controversy. These large and sometimes intricate patterns appear in cornfields overnight and can best be viewed from above.
Some people believe that these designs may be created by aliens trying to communicate with us, or by their aircraft landing in fields. Others feel that they are man made hoaxes made to bemuse the farmers and amuse the creators. The truth has yet to be determined, but they are certainly incredible to see.