Begin your vacation in Vienna, one of the world’s most celebrated cities, renowned for its music, architecture and dance. Transfer to Budapest to begin your Danube voyage. Discover the rolling hills and vine-clad slopes of Pecs before departing Hungary. Soon, you will cruise the portion of the Danube that makes up the boundary between Serbia and Croatia. Traverse the narrow gorges of the Iron Gates, a stunning passage that divides Europe's Balkan and Carpathian mountains. Then, sail along the Romanian-Bulgarian border to Bucharest, the capital and largest city in Romania. Disembark and continue by motor coach to Veliko Tarnovo, the ancient capital of Bulgaria, before arriving in Plovdiv, the second largest city in Bulgaria. Conclude your grand vacation in Istanbul, rich in history that dates back for millennia.