Wow, that is wild, wicked and unreal! It's so fantastic it's almost like watching a video game fantasy of some magical realm or something.
I almost want to try it.
If I had a death wish, I'd try it with my mountain bike.
Ok, maybe not.
I had to do some reading up on this. Some interesting stuff... guess official access was closed off in 2000 due to, oh, who could have foreseen this, tourists dieing while attempting it.
http://en.wikipedia.org/wiki/El_Chorro
http://en.wikipedia.org/wiki/Caminito_del_Rey