[injvstice]

I am not sure where it's established that Stonehenge was built by hunters/gatherers. But if it is true, it would be pretty impressive, given the absence of long distance communication and a low population density per mile (you need 32 mi2 to support 100 people). Aligning a population spread over potentially hundreds if not thousands of square miles behind a single goal is mind boggling (not the least being that if you were to get 10,000 people to agree and bring them to build Stonehenge, the land could not support them without some form of farming or agriculture.)

Ref: https://persquaremile.com/2011/08/17/hunter-gatherer-populat...

[kobeya]

Depends on what you mean by "Stonehenge." The iconic stones are a late neolithic construction, but the site itself is very old. The visible portion today is built on top of a much older ritual structure.

I don't think you'd need 10,000 people to construct a structure like Stonehenge, especially when you consider that these were built over vast intervals of time (hundreds of years per structure, thousands for the entire site).