Budapest, Hungary’s capital, is bisected by the River Danube. Its 19th-century Chain Bridge connects the hilly Buda district with flat Pest. A funicular runs up Castle Hill to Buda’s Old Town, where the Budapest History Museum traces city life from Roman times onward. Trinity Square is home to 13th-century Matthias Church and the turrets of the Fishermen’s Bastion, which offer sweeping views. ―

Kalocsa is a town in Bács-Kiskun county, Hungary. It lies 142 km south of Budapest. It is situated in a marshy but highly productive district, near the left bank of the Danube River. Historically it had greater political and economic importance than at present.

Belgrade is the capital of the southeast European country of Serbia. Its most significant landmark is the Beogradska Tvrđava, an imposing fortress at the confluence of the Danube and the Sava rivers. The fort is a testament to the city’s strategic importance to the Roman, Byzantine, Ottoman, Serbian and Austrian empires, and it's now the site of several museums as well as Kalemegdan, a vast park.

Bucharest, in southern Romania, is the country's capital and commercial center. Its iconic landmark is the massive, communist-era Palatul Parlamentului government building, which has 1,100 rooms. Nearby, the historic Lipscani district is home to an energetic nightlife scene as well as tiny Eastern Orthodox Stavropoleos Church and 15th-century Curtea Veche Palace, where Prince Vlad III (“The Impaler”) once ruled

Constanța is a city on the shores of the Black Sea, in southeastern Romania. Its long history, which goes back over 2,000 years, is documented at the National History and Archaeology Museum, near the port. The adjacent Roman Mosaics complex displays tiled floors dating back to the 4th century A.D. Nearby, the Great Mahmudiye Mosque is furnished with a vast Persian rug, while its towering minaret overlooks the city.

Veliko Tarnovo is a town in north central Bulgaria and the administrative centre of Veliko Tarnovo Province.

Belogradchik is a town in Vidin Province, Northwestern Bulgaria, the administrative centre of the homonymous Belogradchik Municipality.

Novi Sad is a city in northern Serbia on the banks of the Danube River. Standing atop a riverside bluff, much of Petrovaradin Fortress dates to the 17th and 18th centuries, with an iconic clock tower and a network of tunnels. Across the river is the old quarter, Stari Grad, site of the Gothic Revival Name of Mary Church and the neo-Renaissance City Hall.

Osijek is the fourth largest city in Croatia with a population of 108,048 in 2011. It is the largest city and the economic and cultural centre of the eastern Croatian region of Slavonia, as well as the administrative centre of Osijek-Baranja County.

Budapest, Hungary’s capital, is bisected by the River Danube. Its 19th-century Chain Bridge connects the hilly Buda district with flat Pest. A funicular runs up Castle Hill to Buda’s Old Town, where the Budapest History Museum traces city life from Roman times onward. Trinity Square is home to 13th-century Matthias Church and the turrets of the Fishermen’s Bastion, which offer sweeping views. ―

Budapest, Hungary’s capital, is bisected by the River Danube. Its 19th-century Chain Bridge connects the hilly Buda district with flat Pest. A funicular runs up Castle Hill to Buda’s Old Town, where the Budapest History Museum traces city life from Roman times onward. Trinity Square is home to 13th-century Matthias Church and the turrets of the Fishermen’s Bastion, which offer sweeping views. ―