UK's best ruins
Mousa Broch, Shetland, Scotland
Brochs are rather mysterious. Built during the Iron Age, these freestanding, fortified dry-stone towers are a unique ancient feature of northern and western Scotland but no one knows quite what they were used for.
The Mousa Broch is the best-preserved broch, on the deserted isle of Mousa, and stands 13 metres high.
It was built around 100BC with incredibly thick walls, containing chambers that were used for storage the outer diameter is 15 metres, but the inner diameter is just six metres.
You can walk to the top for wonderful views over Mousa Sound. To get here, take a Mousa Boat Trips ferry from Sandwick.
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www.undiscoveredscotland.co.ukImages courtesy of www.britainonview.com. Isle of Wight photo courtesy of britainonview/Martin Brent