PonyHenge is just what the name implies, a Stonehenge-like monument but made entirely of ponies. It is not really known who started putting the horses in this field, but it began in 2010.  The field that the horses now call home is along Old Sudbury road in Lincoln, Massachusetts. The field might be private property, but the owners don’t mind sharing it with these wayward ponies. One rumor of how it began was from a child’s lemonade stand - the children left after their stand was done, but the horses stuck around. Another theory was that someone just left one horse in the field, and then another popped up. After while, it started growing and the horses began multiplying. Sometimes the herd moves to a new pattern, sometimes horses are exchanged, but it all remains anonymous. The owners of this private field like it that way, it adds to the mystery that is PonyHenge