These ancient structures still stand - but the people who built them remain a mystery that history can’t fully explain.

The Sein Island submerged stone structures include a football-field-long granite wall off Brittany that dates back more than ...

Far off the coast of Brittany, a line of stone blocks lies hidden beneath the Atlantic, preserved where dry land once met the sea. Archaeologists now argue that this submerged barrier, built around 7, ...

A megalithic burial mound in Spain was built using “advanced engineering” 6,000 years ago, with stones weighing several times more than any used to make the UK’s iconic Stonehenge, archaeologists ...

Archaeologists rarely expect clarity when surveying the ocean floor, since water tends to erase context rather than preserve ...

The mysterious alignments of standing stones scattered across Brittany in France have intrigued archaeologists and tourists alike for centuries. Now, fresh discoveries at the Le Plasker site near ...

A dog walker along the U.K. coast found stone structures later identified by archaeologists as centuries-old bait tanks, photos show. Photo from Sarah Winlow via Northumberland Coast National ...