Megalithic Britain
Sources
https://en.wikipedia.org/wiki/Avebury
https://en.wikipedia.org/wiki/Stonehenge
https://ohiostate.pressbooks.pub/app/uploads/sites/198/2019/06/Stonehenge-Plan-300x275.jpg
https://www.avebury-web.co.uk/bhengemap2a.png
https://grahamhancock.com/silvaf5/