Brochs are found in the Orkney’s, Shetlands, Western Isles and the Scottish mainland. They consist of dry stone towers about 10 metres (33ft) in height and about 25 metres (82ft) in diameter. The walls are thick at the base tapering towards the top. They usually feature two concentric circles with stairways and chambers incorporated in the core of the wall. It is believed that this form of construction was very efficient from an insulation perspective.

Here are some images of the remains of a Broch on the Isle of Skye.

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