Try this one Andy.
We have one of those here, tallest in the Southern Hemisphere. 328metres, with clear glass floors on one of the viewing platforms. Even if you don't get vertigo, throws the eye for a moment.
http://www.skycityauckland.co.nz/Attrac ... tower.html
You can walk around it: http://www.skywalk.co.nz
You can jump off it: http://www.skyjump.co.nz/
Awesome, although I think I'll not bother with that 'jumping off' malarky next year... (visiting the Sister in Law who lives just North of Auckland)