Also known as a fairy circle, they are best left undisturbed. As the Fey are not oft fond of intruders disturbing their lands, and their special places. Otherwise, they may require compensation for what is theirs.
Bit of a strange one, but had the idea presented (and initially sketched) by Sarvak, and rather enjoyed the premise and challenge of it, so had some fun and doodled up a little with it. Anyways, enjoy the weird!