Stonehenge was built by people who came from as far away as modern-day Turkey, a study has suggested.
The same nomadic builders also introduced agriculture to Britain.
They arrived around 4000 BC - around a millennium before the prehistoric monument was erected.
The findings were published in the journal Nature Ecology & Evolution and depend on DNA analysis of 67 Neolithic and six Mesolithic individuals in Britain.
The researchers compared the data from the Neolithic people with DNA from people alive at the same time in Europe - specifically, Iberia (Spain and Portugal).
The Neolithic inhabitants appear to have travelled from Anatolia (Turkey) to Iberia and then north to Britain.
The migration was part of a massive expansion of people out of Anatolia that began around 6000 BC, and there is overwhelming support for the theory that agriculture came with them.
Although Britain was already inhabited by smaller groups of "western hunter-gatherers", it seems the large numbers of newcomers didn't mix well with the locals, the study says.
There was little interbreeding and the British hunter-gatherers were almost completely replaced by the Neolithic farmers.