I'm with targa - I'm dizzy just looking at the picture.
As I get older my tolerance for stuff like that gets worse. I have a terrible case of vertigo. No way I could manage the stair climb up, and down would be even worse, don't even get me near the edge. Needless to say my years of downhill skiing is coming to an end soon. Did Dave's run last winter at Mammoth - that will be the last time...
Some of the chair lifts there are starting to freak me out.