Avebury
Wikipedia - "There are three related types of Neolithic earthwork which are all sometimes loosely called henges. The essential characteristic of all three types is that they feature a ring bank and ditch but with the ditch inside the bank rather than outside. Because of the defensive impracticalities of an enclosure with an external bank and an internal ditch, henges are not considered to have served a defensive purpose (cf. circular rampart)."
Wikipedia, Marden Henge: Stonehenge's big brother
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