Die Frau mit den Millionen - 1. Der Schuß in der Pariser Oper Filming Locations

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.

Berlin, Germany’s capital, dates to the 13th century. Reminders of the city's turbulent 20th-century history include its Holocaust memorial and the Berlin Wall's graffitied remains. Divided during the Cold War, its 18th-century Brandenburg Gate has become a symbol of reunification. The city's also known for its art scene and modern landmarks like the gold-colored, swoop-roofed Berliner Philharmonie, built in 1963.

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.

Istanbul is a major city in Turkey that straddles Europe and Asia across the Bosphorus Strait. Its Old City reflects cultural influences of the many empires that once ruled here. In the Sultanahmet district, the open-air, Roman-era Hippodrome was for centuries the site of chariot races, and Egyptian obelisks also remain. The iconic Byzantine Hagia Sophia features a soaring 6th-century dome and rare Christian mosaics.

Sofia is the capital of the Balkan nation of Bulgaria. It’s in the west of the country, below Vitosha Mountain. The city’s landmarks reflect more than 2,000 years of history, including Greek, Roman, Ottoman and Soviet occupation. Medieval Boyana Church has 13th-century frescoes. Built by the Romans in the 4th century, St. George Rotunda Church has medieval and Ottoman decoration dating to the 10th century.

Venice, the capital of northern Italy’s Veneto region, is built on more than 100 small islands in a lagoon in the Adriatic Sea. It has no roads, just canals – including the Grand Canal thoroughfare – lined with Renaissance and Gothic palaces. The central square, Piazza San Marco, contains St. Mark’s Basilica, which is tiled with Byzantine mosaics, and the Campanile bell tower offering views of the city’s red roofs.