At first glance, the northernmost speck on the map of Orkney could easily be overlooked. Yet, the rocky shore of low-lying North Ronaldsay is anything but ordinary. Venture to this tiny Scottish isle and you'll find the tallest land-based lighthouse in the UK, the ruins of an Iron Age broch (a type of drystone roundhouse) and – most bizarrely – a flock of wild-eyed short-legged sheep with a diet that's as unusual as their remote habitat.

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