Low tides reveal Bronze Age fortress that likely defended against Irish mainland

The remains of the walls or ramparts are now covered in seaweed and can only be clearly seen when the seaweed is removed.

Low tides on Ireland's western coast have revealed the remains of defensive walls that are likely Bronze Age ramparts.

Archaeologist Michael Gibbons discovered the ramparts, which are made of large limestone blocks, on a partially submerged isthmus, a narrow strip of land between two parts of the sea. But he's only recently obtained photographs of the site, which has enabled him to publicize the ramparts for the first time.