I see that crop circles are in the news again. If you are into that sort of thing, there are crop circles around Boardman that are so large they can best be appreciated from outer space! Check it out on Google Earth, at 48 degrees 54 minutes north, 119 degrees 35 minutes west.
The universal characteristic of these crop circles is substantial chemical residue of oxygen dihydride, which does not occur naturally in that area.
If you pan north, there are also some similar crop circles across the border in Washington.