Belgrade, the capital city of Serbia, is a buzzy hub of the country's business, cultural, gourmet and nightlife scene. Its vantage point at the confluence of Sava and Danube rivers presents the traveler with a mélange of old and new, traditional and contemporary, meditative and vibrant. Explore everything from the seats of power like the Parliament, to the happening Knez Mihajlova Street, venture up to Kalemegdan Park and fortress, then cross Sava River by a fisherman boat for a tasty lunch. Walk it all off in Belgrade's colorful old part, Zemun.