5. Berlin, Germany
Sure, islands are relaxing and all, but what about the on-the-go cosmopolitan couple who requires a city break instead? With nightlife to rival any international metropolis and a foodie scene to boot, Berlin has a solution for all those big-city honeymoon needs. And best of all, it still reigns as one of Europe's most affordable trips. (Fares from New York and Miami on AirBerlin run as low as $99 each way.)

Explore the sites vital to the Cold War like the ghost stations, Checkpoint Charlie, the Brandenburg Gate, and, of course, the Wall. Then head back to relax in the Hotel de Rome, an ornate bank-turned-luxury-stay, and maybe indulge in a spa treatment or two in your downtime (you can even have dinner and couples treatments in the subterranean vault of the bank). Then, hop on a gastro tour courtesy of Berlinagenten in the hip neighborhood Kreuzberg, and burn the midnight oil in some of Berlin's all-night riverside bars and clubs to top off a perfect day.

Theater enthusiasts will be in awe of the combined musical and acrobatic elements of the whimsical "Soap: The Show" at the Chamäleon. Electronica lovers and those who want to dance the night away will dig the all-night clubs like tri-level Weekend and the waterfront Spindler & Klatt. Berlin's a win no matter your big-city tastes.