Waden Hill Crop Circle. This crop circle was created in 2005. The field where this crop circle is located overlooks the stone circle of Avebury, and has hosted many enigmatic and controversial formations in years past. This is certainly one to add to that memorable list. The design itself consists of a 'Penrose Triangle' with sides measuring some 126ft in length, surrounded by a circle of laid crop and then an intricate and complex pattern of laid and standing crop around the perimeter.