Maumbury Rings

Maumbury Rings is a Neolithic henge in the south of Dorchester town in Dorset, England. It is a large circular earthwork, 85 metres in diameter, with a single bank and internal ditch and an entrance to the north east. The ditch was created by digging a series of funnel-shaped shafts, each 10 metres deep, which were so closely positioned as to create a continuous trench. Human and deer skull fragments were found in the ditch fill when it was excavated in the early 20th century.

• http://en.wikipedia.org/wiki/Maumbury Rings