Poring over a map one day, Ewan McGregor—film star and bike nut—noticed it was possible to ride all the way around the world, with just one short hop across the Bering Strait. So he called Charley Boorman, his best friend, fellow actor, and bike nut. From London to New York, Ewan and Charley rode their BMWs through Europe, the Ukraine, Kazakhstan, Mongolia and Russia, across the Pacific to Alaska, then down through Canada and America. Exhaustion, injury, and accidents tested their strength, as did treacherous roads and weather. They were pursued by paparazzi in Kazakhstan, courted by men with guns in the Ukraine, and served bulls' testicles for supper by Mongolian nomads. Yet despite the many obstacles, they managed to ride over 20,000 miles in four months. As they traveled, they documented their trip, taking photos and writing diaries.