Step up to the ledge, look down at the drop, and find out what you're made of. There's nothing quite like the sensation of flying through the air like a superhero, so treat yourself to a simple and unforgettable thrill - you won't regret it. There are a couple of variations of zip lines, the most common being a simple high-speed traverse, harnessed to a wire over a valley or gorge. The Tyrolean drop involves unclipping the harness and dropping into a river running below.