Feinics wrote:

sometimes yes they are but ya see here fairy faith is complex and ancestors were considered to go to the "gentry" when they died so often historical sites of crannogs and the like were called fairy forts but mostly the remaining earthen  banks as the fairy folk are considered to live in the hills! a fairy fort tho usually a place that even in modern times goes undisturbed by development due to long held superstition and tradition. im intrigued tho tell me more of these fairy rings? :) what exactly are they?

Well here is a good scientific expiation  Fairy Rings by Richard L. Duble, Turfgrass Specialist  Texas Cooperative Extension and here is what   Wikipedia, has to say about Fairy rings, also known as fairy circle, elf circle or pixie ring

This story in theWiltshire Times, gives some other names and local folklore on Fairy Rings.