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At the beginning of his journey, Mark Beaumont sets off near Anchorage, Alaska, and is treated to an impromptu prayer session with the locals, in a remote burger bar where he is topping up the 6,000 calories he needs each day to keep going.

Further along the road in Alaska, he joins a team of mountaineers to scale Mount McKinley, at 20,320 ft, the highest peak in North America, and the first of two daunting climbs he will undertake on the adventure. One of the coldest mountains on earth, McKinley has a fearsome reputation, having claimed 100 lives.

Mark also faces a variety of different dangers, from black bears at the roadside, huge RVs driven by ageing American holidaymakers to a forest fire which stops him in his tracks.