Yikes!  For some reason I was reading about John Krakauer, went back over the 96 disaster on Everest and landed up here.  Watch this amazing ascent of Tahir Tower in Pakistan.  I got vertigo just watching a few of the slides.  The whole climb is documented, including the bivouacs on the ledge.  Wonder if one can get a good night's sleep knowing you are inches away from the abyss.   Do any of you folks rock climb? 

Nerves and muscles of steel, these young climbers.   WOW!

http://classic.mountainzone.com/climbing/2000/forbidden/photos/disp-photos/photo16.html