Excavation and geophysical surveys have shown that at least two circular wooden structures once stood within the banks.
One, near the south eastern entrance consisted of a series of five concentric wooden postholes, with an outer diameter of 38 metres (125 feet). The other wooden structure, standing to the north, had two rings of posts and measured 27 metres (89 feet) in diameter.
Both structures at Durrington Walls seem to have been built in several stages