mysterious circles

Have ever heard about mysterious circles' stories? When i have heard about circles on the TV for fist time, i have thought that its are made by a computer. Because those shapes are amazing and unbelievable. Some artists have tried to draw some of them, but it was not too easy to draw, they need to do very difficult mathematics.
Because of its mystery, a lot of scientists who have studied the circles say that the circles are perhaps made by the wether special kind of storm. Howerer, they do not have any certain evidences.
Some people believed they were made by visitors from another planet. In other words, by aliens.
However, two british artists appeared on TV in 1992s. They said how for many years they had made many circles in english fields. but other artists say that they are lying, they just want to become famous.
Anyway, until nowadays, noboday can find out where the circles come from.
How do you think about circles? Did they come from another planet? or Were they make by the weather, or artists.
I'd like go to the places where has circles and stonehenge. I want to see those strange but true shapes by my own eyes.