In South Africa.

It claims to be the world’s fastest, highest, longest, steepest zip line. The specs are in the video. It was a lot of fun and not too scary. Except when you are looking down from the top of the mountain.

How to make a Zip line
danger level - high
materials
* Nylon or poly rope
* Ski rope handle
* Pully (appropriately rated)
tools
* Utility knife
how-to
1. After scoping out where you want your zip line to go, cut the rope to length, leaving plenty of extra for tying knots. Melting the cut ends with a flame keeps the rope from unraveling. Make sure that both the rope and the pulley are rated to handle the type of loads you will put on them.
2. Attach the handle to the pulley. This is the trickiest part because of the varying designs of pulleys. You may be able to just tie both ends of the ski handle to the pulley, or you may have to devise something using some extra hardware.
3. Loop the pulley onto the rope and tie up the rope at the start and finish, making it as taunt as possible. Tie your knots well but make sure you can adjust one end because the rope may stretch out with use.
4. Tie a scrap piece of rope to the handle bar for the purpose of pulling it from the end of the line to the beginning.
5. Once you’re confident in the integrity of your setup, hang on tight and give it a try. Make sure you plan the ending; you don’t want to be going too fast when you come to that second tree.
[Source: Dangerously Fun]

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