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 ...

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

A stone monument in Spain with multiple burials has recently been discovered. Archaeologists were intrigued by the finding, as it contained several prehistoric burials, according to Live Science. The ...