http://www.stonehengeusa.com/ http://www.stonehengeusa.com/http://www.physics.usyd.edu.au/~sgb/SillyPictures/Carhenge.jpg
Somebody has been industriously piling field rock into something recognizable. Before it was fenced off and got made into some kind of museum it was a few big stones and a lot of large stones kind of in a meaningless heap like it got picked over by farmers for a couple hundred years. There was the big sacrifice stone still there.