Won't be as high as Eureka nor Syd Tower, but doing it blindfolded is an interesting concept.

Photo's from Business Traveller mag.

http://img.photobucket.com/albums/v326/emerbot/scan_552610226_1.jpg
http://img.photobucket.com/albums/v326/emerbot/scan_5526102447_1.jpg

And if you really want to shit yourself, have a look at this..

It's the new ride on Stratosphere in VEGAS.. I though the rollercoaster was out there.. but the new "ride" is well out there.

http://www.stratospherehotel.com/las_vegas_stratosphere_ride.html

I've been to the Stratosphere observation deck but there was no way in hell I was going to touch any of those rides.