Crop circles or circular patterns in the fields of agriculture, reportedly first appeared in England in 1647. Widely publicized appearance in the media since the late 1970s. This phenomenon was most mysteriously appear at night.
Crop circle is almost always associated with the story of a UFO (Unidentified flying object), despite the fact that, most of the pattern that proved human-made or caused by natural factors. Only about 20 percent of the ihwalnya still a mystery, until now.
Here, a number of corp circle from time to time: