It started as a daydream. Poring over a map of the world at home one quiet Saturday afternoon, Ewan McGregor -- acclaimed actor and self-confessed bike nut -- noticed that it was possible to ride all the way round the world, with just one short hop across the Bering Strait from Russia to Alaska. It was a revelation he couldn't get out of his head. So he picked up the phone and called his fellow actor-slash-biker...
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