(Inside Science) – New research suggests that megaliths — monuments such as Stonehenge created from large rocks during the Stone and Copper Ages in Europe — owe their origins to a mysterious culture from northwest France with advanced seafaring technology.

Roughly 35,000 megaliths are known throughout Europe, including standing stones, stone circles and megalithic tombs. Most megaliths date from 4500 to 2500 B.C., are concentrated in coastal areas along the Atlantic and Mediterranean an