Dun Charlabhaigh Bloch

One of our discoveries in the Outer Hebrides was a building type called a “broch.” These hollow, Iron Age structures are found only in Scotland and are thought to have served a defensive military purpose, a kind of forerunner to medieval castles and towers. Most surviving brochs are only a couple of meters tall but Dun Carloway Broch on the Isle of Lewis reaches 9 meters in some places. Bending low to climb inside, we could see the unique double wall construction, with the two walls converging as they reach the top in an Escher-like twist.