4/4/14, Wake up in Belgrade, capital of Serbia. Take a guided walk through the grounds of Kalemegdan Fortress, now a beautiful park; also see the Orthodox cathedral and stop at the Square of the Republic. Lunch aboard, then free time to explore Belgrade’s gracious architecture or visit one of its many museums, like the Nikola Tesla Museum. Dine aboard or experience some of Belgrade’s nightlife—we depart very late this evening.