Far off the coast of Brittany, a line of stone blocks lies hidden beneath the Atlantic, preserved where dry land once met the ...

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

An autonomous robot with a large gripper can transform a pile of boulders into huge stone walls without mortar – learning on its own how to place each irregularly-shaped stone as the next building ...