Europe is less than half the size of the United States, yet it contains a dizzying array of climates and cultures, from sunny Greece to the misty North Sea, and from Spain's whitewashed villages to St. Petersburg's white nights. That is perhaps what makes Europe unique and so appealing to travelers. In a day's time, or even in just a few hours, you can find yourself in a different landscape surrounded by residents speaking a different language. The hardest part is choosing among the many destinations-the Aegean or the Adriatic? The Balearics or the Baltic? The Costa del Sol or the Croatian coast? Wherever you decide to go, you are guaranteed a fascinating journey through some of Europe's historic and cultural highlights.