Over the past decade, author Peter Potterfield has hiked more than 10,000 miles over six continents to research this list. He here tells us his picks for the world's 15 best hikes, including Patagonia, Tasmania, Newfoundland, and Petra. Read more in his best-selling book Classic Hikes of the World or his forthcoming book Classic Hikes of North America (to be released in 2012).

Hit the Trail With National Geographic Maps