I feel like there is a hint of competition right here. I think every country wants to own "THE World's Tallest Building" and some countries have attempted and successfully got the title. To name a few...
I think the Petronas Twin Towers are the best looking.
Petronas Towers, Kuala Lumpur, Malaysia
HERE COMES DUBAI!
Currently in Dubai, a supertall skyscraper is under construction. Let me tell you, I choked when I found out how many floors it will have when it will be finished.
ONE HUNDRED AND SIXTY. Yes 160 earthlings!
I think someone with fear of heights like me can't go up the observatory (if there is) of this colossal structure.
Believe me when I went up the Rockefeller's GE observatory deck, my knees were shaking already and that's only what? the 76th floor?? However I saw great view of NYC.
cheers.
