In Punta Arenas, Chile, in November 1998, Karl Bushby set out on one of the most remarkable journeys of modern times. His plan is as simple as it is extraordinary: to walk up the Americas, across the Bering Straits, through Asia, Russia and Europe, back through the Channel Tunnel and returning to Britain in 2009. It is a journey of remarkable endurance -- 20 miles a day, 3,000 miles a year, 36,000 miles in total. By the the time Karl returns, he will...