The World's 6 Most Insane Ziplines
By Thrillist .
Combining speed, height, and a totally flimsy harness that in no way looks like it can hold you up, ziplining is sheer excitement meets pure terror – an exhilarating ride atop some of the planet's most gorgeous landscapes. But which lines are worth the zip? From 165ft underground to 1,000ft in the air, here are six of the world's longest, fastest, and wildest.