Geoglyph:
Carved into the chalk of a hillside in southern England, the Uffington White Horse is utterly unique. Stretching 360 feet from head to tail, it is the only prehistoric geoglyph—a large-scale design created using elements of the natural landscape—known in Europe. [“White Horse of the Sun,” Eric A. Powell, Archaeology (Sept/Oct 2017)]
Also comes with a nifty picture.
Good article, too.