There's supposed to be a small fault along the creek, about a half mile from here. And there's an Indian burial mound just across the road at another spot on the creek, but I don't know if that explains any of the strange things that happen here in my back yard. Some of the pictures show what looks like some kind of energy coming up out of the ground. So maybe you're right. Other things besides the BFs could be attracted to the place.
A few years ago, a neighbor told Hubby that he saw a "ghost" crossing the road at the creek, by the burial mound, one night. I just assumed that it was one of the white BFs, but maybe not.