Shetland: Broch of Clichimin
Shetland is quite famous for several of Iron Age structures known as brochs – round stone towers that served most likely a defensive purpose. The word broch is Scottish and means fort. There are about 120 sites in Shetlands that are brochs in different states of preservation. One of the best preserved and accessible is the Broch of Clickimin, built on a small island in the middle of Clochimin Loch (lake). It really looks and feels like a medieval round defensive tower, except it dates to the 4th century BC! There are multiple levels and stairs inside the structure and large horizontal slab stones form floors and dividers. The rooftop offers a good view of the entire structure.
