In this YouTube video, Thomas Harrison-Lord takes us to ZipWorld Velocity in Wales which catapults you down over an old slate mine at over 100mph.  It is the longest Zip Wire in Europe and the fastest in the world.

Here is what it's like to go down it, from the journey up to the top to the disembark at the end.  A birds-eye view.  It's absolutely incredible.  It is definitely even higher and quicker than it looks here when you do it in person....