This 2,000-year-old city, where the Teutonic Order founded one of its first commanderies in the 13th century, lies on the convergence of the Moselle and Rhine Rivers. Hop on a cable car, one of the city's most popular attractions, for stunning city-wide views, or cruise down the Rhine to spot some of Koblenz's magnificent fortresses and castles, including the Ehrenbreitstein Fortress and Schloss Stolzenfels.

Part of the British Virgin Islands, Virgin Gorda is an island in the Caribbean famous for The Baths National Park, whose natural geologic granite formations dot the island's beaches and create stunning tidal pools and grottoes.

This small yet charming city in Alaska's panhandle is a throwback to the gold rush era. Skagway is a well-preserved part of Klondike Gold Rush National Historical Park.

To visit Barcelona is to embrace both the past and the future. There is much to do and see in this cosmopolitan capital of Catalonia, from medieval structures to beaches to UNESCO Heritage Sites by Antoni Gaudí and Lluís Doménech i Montaner.

Terre-de-Haut is an island off the coast of Guadeloupe and replete with a variety of stunning viewpoints to gaze out at the sparkling waters of the Caribbean Sea.