Though wilderness zip line tours aren’t exactly new, they've only recently begun proliferating in the U.S.. Hundreds have sprouted up in the last decade, and many more are being built. You have many ...

Harness secure. Hands on the trolley. Heart pounding. You hear the words over the guide’s walkie-talkie: “Clear, clear, clear.” Gulp! It’s time to take the leap — literally and figuratively — although ...