The Broch of Gurness, is located on the N.E. coast of Mainland Orkney which is the principal island forming part of an archipelago off Scotland’s N.E. coast. A broch is, usually, a tall, conical-shaped tower with concentric circular walls. The structures date from the Iron Age ( 800 BC-AD43) and are unique to Scotland with the majority  of the 500 structures spread throughout northern and western Scotland and the islands.