Frankfurt is, to the surprise of many visitors, smaller than expected. Much of the historic inner city was heavily destroyed during World War II, but even so, it is now known as a major business center and a European hub for air, rail and road traffic. It also boasts Germany's most spectacular skyline, mirrored in the Main River, a thriving arts scene and Europe's tallest office building. All of this with the title of Germany's most international city—more than a quarter of Frankfurt citizens are foreign.
The city throws more money at the arts than any other in Europe, so there''s always a groundbreaking exhibition at one of its museums to catch. And if you do happen to get stuck at the mega-airport, there's a nightclub, art gallery and an X-rated cinema to help while away those in-transit hours.