Ping
We don’t know but....Yeah it was Space Aliens.
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Got to be another explanation.
That’s a lot of work to be a passive traffic guide when a stick and arrows would do.
Spaceship parking lot markers.
No one knows who they were, or what they were doing.
I guess they were roofed over, and used for food storage and/or lodging, for crowds to attend events
If you have Amazon Prime, there is a British series called “Walking Through History” with Tony Robinson and the Season 2 (2013) Episode 1 is called “The Path to Stonehenge”. It is a good gloss of the known history (changed a bit since) but excellent for seeing the countryside. This does include a brief stop & talk on Durrington Walls.
Recommended for Anglophiles for the entire series. Another excellent episode talks about ‘Poldark’ country in Cornwall and why smuggling was so big in the 1780s-1820s. The answer is, in part, very high custom duties (up as high as 150%) on many things readily available in France and the Channel Islands. Smuggle or go to debtors prison, what a choice!