To my delight, a few years back I found a ‘fairy ring’ in my own backyard.
I realize it is a the mushroom springing it’s spores in some kind of little explosion and then they grow, but nevertheless I found it wonderful to see, because of it’s relation to all those amazing tales.
Love the photo :)
FYI: The captured launch of a ballistospore
http://www.mycologia.org/content/97/4/866.full