崇山峻岭极地行 第二季免费在线观看完整版未知　　Ryan's human-powered adventures are always inspiring as he proves that anyone can get out and explore the great unknown. Extreme Treks is part adventure, part exploration and part education. The best way to understand and respect the world around us is to put yourself right in the path of Mother Nature.　　Episodes: Tanzania, Morocco, China, USA, Peru, Nepal, Italy and Oman.