since this goes up to 2010 it's pretty close to being *all* cities with 1000 ft skyscrapers. Not a bad quiz, but, the title would seem more accurate maybe if you cut it off sooner, like, say, around the year 2000, or maybe in the 1990s.
I guess... if you never update it... in 10 or 20 years it will seem more historical. :) and the number of cities with buildings this size is increasing all the time, especially in Asia these days.