Henges have a ditch with an outer bank. At Stonehenge it is reversed, with a ditch OUTSIDE the bank - effectively making the world around it the structure for which it is named.
http://en.wikipedia.org/wiki/Henge
Henges have a ditch with an outer bank. At Stonehenge it is reversed, with a ditch OUTSIDE the bank - effectively making the world around it the structure for which it is named.
http://en.wikipedia.org/wiki/Henge