You have studied it all: the Italian Renaissance, Spanish Conquests, French Revolutions and Greek Mythology. Millions of people travel from the United States to Europe every year to get a taste of that rich history, but don�t get stuck in the past � these popular European cities have so much more to offer. Imagine sipping wine with the fashionable, cigarette-smoking urbanites of Paris and Milan, or exploring rugged eastern states that are still crafting their national identity, and you wll find that Europe is a seamless blend of modern and ancient civilization. That�s why so many students travel there for study abroad, gap year and vacation. The challenge is picking from the hundreds of unique cities to visit.The good news? Once you reach one country, visiting the rest is a cinch. Hop between Dublin, Paris, Venice and Copenhagen for as little as $18 a flight. Just make sure these top European cities are on your radar. Europe is waiting for you!