13. Frankfurt, Germany

Certainly one of Europe's most interesting cities in terms of skylines, Frankfurt is home to five structures that are over 200 meters tall. These modern skyscrapers are marvels compared to those other, mostly non-existent ones scattered across European cities. The contrast here is interesting: The city combines low-rise, high-density traditional European architecture (some of which is over 1,000 years old), with modern towers that stick out like sore thumbs, but are impressive nonetheless.

Metro/Urban Population: 4.1 million