Henge. A Henge is a prehistoric monument with a ditch enclosed by a bank. Some have entrances: one, two or four. Some have stone circles inside them. Confusingly Stonehenge is not a Henge. Henges are usually dated around 2400BC typically known as Late Neolithic Early Bronze Age. Examples of Henges include Avebury, Wiltshire [Map] in Wiltshire, Arbor Low Henge and Stone Circle [Map] in Derbyshire. Henges appear to be a peculiarly British monument.

3100BC. The Stones of Stenness [Map] is a Henge and Stone Circles erected around 3100BC based on radio-carbon dating; it isn't clear who undertook the dating? Aubrey Burl, in his book "A Guide to the Stone Circles of Britain, Ireland and Brittany", states "The setting [Stenness Type Cove] had consisted of three erect stones, two in line side by side, N-S, separated by a narrow gap behind which the third stood like the backstone of a chamber. It is a form of Cove./

Mayburgh Henge [Map] is a Henge.

King Arthur's Round Table is a 90m diameter Henge with a ditch of around 16m. There appears to have been two original entrances.

Little Round Table is a Henge two hundred metres south of King Arthur's Round Table; it is mostly destroyed