Nasty suspicion

I'll post images of two of the kind of rock piles that began my turn from skepticism to curiosity. They were at sites in Berks and Monroe Counties in Pennsylvania. I knew that Berks was settled by Germans and Monroe was not. How, then, would crazy farmers or bored teenagers or whoever it was wind up building such similarly placed piles? A nasty suspicion stole over me--it almost looks like these places were built by the same people. But . . .