Book excerpt: A great walk can be an exhilarating experience that will stay with you forever. Perhaps you're stirred by endless mountain views or soothed by stepping into a living green cathedral. Maybe the challenge drives you harder and farther than you thought possible. Sometimes you'll find yourself in the presence of a rare creature and feel a jolt of connection. There's always magic to be found when walking but the very best walks will do all of these things. Fortunately, Australia is full of extraordinary walks - here's our collection of the best to be found in every corner of this country.