ThelifeShutterstock.com Istanbul ranks as having one of the world's best skylines.
International building database Emporis attempts to quantify skylines by looking at the number and height of buildings in the world's major cities. The result is an ever-changing ranking of the world's most impressive cityscapes.
To rank skylines, Emporis looks at completed skyscrapers (40 floors or more) and high-rises (12-39 floors), and assigns each building a point value based on its floor count. Taller buildings receive significantly higher values (see Emporis' complete methodology here). TV towers, masts, bridges, and other structures are excluded.
Chicago recently fell in the rankings, while Seoul rose two spots.