Mallorca's mad masterpiece: twelve kilometres of corkscrewing descent through the Tramuntana range to a pebble cove, including the famous 'tie knot' where the road loops 270 degrees underneath itself. Engineer Antonio Parietti designed it in the 1930s with no purpose beyond the pleasure of driving it. There's no way out but back up, which is rather the point. Go before 9am — coaches and hire cars clot the bends by mid-morning — and swim at the bottom.
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