A true gem on the Caribbean coast, the port city of Cartagena (Cartagena de Indias) welcomes visitors with its charming old town, colonial buildings, and exceptional beaches. A popular cruise ship stop, many seafarers find themselves honorary Cartagenans, as they stroll shady, cobblestone lanes and gaze upon impressive churches.

Northern Ireland's capital and the birthplace of the RMS Titanic.

This thriving port city has so much to offer, including several museums, the beautiful historic quarter Porto Antico and La Lanterna. This lighthouse is Genoa's best known landmark and provides stunning views over the port and bay.

Replete with windmills and old-world charm, the village of Kinderdijk lies east of Rotterdam on the Lek River and is a popular stop for European river cruises. Home to the largest concentration of old windmills in the Netherlands, Kinderdijk was designated a UNESCO World Heritage Site in 1997.

St. Lucia is an island of verdant landscapes in every direction: A dense rain forest rises up and covers The Pitons' twin peaks, and in the valleys, the sun's rays dance upon the large yellow-green leaves of banana plants. Beyond all the greenery, you'll find isolated coves, stunning beaches, colonial towns, quiet fishing villages and first-class yachting facilities.

Ulm, Germany, a picturesque city on the banks of the Danube River, offers a rich tapestry of history and modern charm. Dominating its skyline is the Ulm Minster, home to the tallest church steeple in the world at 161.5 meters (530 feet). This Gothic masterpiece invites visitors to climb its 768 steps for a breathtaking panoramic view of the city and the surrounding countryside.