Seabourn Quest: 21-Night Northern Europe from Hamburg

Hamburg is Germany's second-largest city and its biggest port, sitting about 100 kilometers inland from the North Sea on the Elbe River. The city serves as a major embarkation point for Northern European, Norwegian fjord, and Baltic Sea cruises, with a growing role as a port of call on repositioning and British Isles itineraries.

Zeebrugge is a North Sea port about 15 km from Bruges, one of Europe's best-preserved medieval cities. Ships dock at Zeebrugge, but the destination is Bruges: a city of 120,000 people whose medieval center survived the centuries virtually intact because the city's commercial importance faded after the Zwin river silted up in the 15th century, and nobody had a reason to tear anything down.

Dover is one of England's busiest cruise ports, sitting on the Kent coast at the narrowest point of the English Channel, just 21 miles from Calais, France. The White Cliffs of Dover, the chalky coastal escarpment visible from sea, are England's most recognized natural landmark and the first or last thing passengers see as they arrive or depart.

Norway's third-largest city, and its original capital. Trondheim sits on a peninsula in the Trondheim Fjord, founded in 997 AD by Viking King Olav Tryggvason.

Tromsø is northern Norway's largest city and a major Arctic cruise hub, located about 350 kilometers north of the Arctic Circle at 69° north latitude. The city sits on the small island of Tromsøya, connected to the mainland and neighboring islands by bridges and undersea tunnels.