Six hours in Vienna

Vienna is much less ideal than Bologna for the 6-hour layover, but that doesn't mean it's not dizzingly magical. Float through this city and just try not to hum the Blue Danube Waltz to yourself.

Six hours in Bologna

Everyone knows about airport layovers. That block of time that's usually too short for you to leave the airport and see the city you're in, meaning you have to make do entertaining yourself with overpriced chain restaurants, books off the New York Times bestseller list, duty-free shops, and maybe choreographing a dance routine on the moving sidewalk.