Alpha, it is on again tonight, I will be glued to the box watching that. I like to know past histories, and what went on, macabre as it may be, how else do we learn about it. I will be ok, as long as no one goes BOOOOOOOOOOOOOOO!
I grew up with a knowledge of Fairy ring forts. They usually consist of a hill mound in the middle of a field, with trees growing in a circle on the top. Mostly they are not disturbed by the farmers and are sometimes fenced off. In other cases cattle and other stock use them as shelters. Still quite an amount of superstition surrounds them.
Also there are single trees found growing in the middle of a field - known as "fairy trees" I remember, a few years ago, people in a particular area would not allow a fairy tree to be dug up when a new road was planned. Eventually the planners had to reroute their road to satisfy the local people. They, the locals, feared that, if their tree was disturbed, it would bring BAD LUCK!