From Science, “Stonehenge, Other Ancient Rock Structures May Trace Their origins to Monuments like This”

Stonehenge may be the most famous example, but tens of thousands of other ancient sites featuring massive, curiously arranged rocks dot Europe. A new study suggests these megaliths weren’t created independently but instead can be traced back to a single hunter-gatherer culture that started nearly 7000 years ago in what is today the Brittany region of northwestern France. The findings also indicate societies at the time were better boaters than typically believed, spreading their culture by sea.

The seafaring part is interesting. Since those people evidently did not do boat burials (on land), we have no idea what kind of vessels they had, but they had something.