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23 places to visit once in lifetime

23 places to visit before dying

The four daredevils wave as they salute their efforts after climbing to the top of The Castle off Orkney's west coast

Daredevil climbers pick their way up perilous stack of rocks

The four adventurers were photographed their way up a mass of rocks (pictured) on Orkney's west coast, known as 'The Castle', to stand triumphantly on the top as the wave crash below.