I read an article about this in Singletrack magazine. A path carved in the roc in that goes up 1,000m in just 3.5km. Normally forbidden to cyclists (a tiny handrail is all that prevents you from certain death if you fall off the side), the two guys had special access and it says they didn't even dab a foot on the whole downhill.
Some sections just make me feel sick Must be a nice hike though
http://vimeo.com/54892632
[img]http://cache.virtualtourist.com/4/4141085-Gemmi_weg_The_Hard_Way_Up_Leukerbad.jpg[/img]