this is my favorite "never built" skyscraper proposal of all time.
Bertrand Goldberg's original 3 tower vision for river city:
source:
http://www.architechgallery.com/arch...ity_towers.jpg
this is what actually got built. it's not bad, but it's not nearly as cool as what could have been.
source:
http://www.iscec.com/images/rc/rc-pic-001.jpg