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.

The Irish Republic's second largest city is a surprisingly appealing place - you'll find time passes effortlessly during the day, and by night the pub scene is lively. The town center is uniquely situated on an island between two channels of the Lee River.

Perched on a ridge overlooking the Dudh Koshi River valley, Tengboche is home to one of the most iconic monasteries in the Himalayas. The Tengboche Monastery dominates the skyline, its whitewashed walls and golden roof visible from miles around. Surrounded by towering peaks such as Ama Dablam, Kangtega, and Thamserku, the village offers visitors sweeping panoramas and a sense of quiet reflection high in the mountains.

Located on Ecuador's central coast, Manta is a port city frequented by many South American cruises. Manta is known for its delectable seafood and variety of pleasant beaches.

Juneau's majestic sprawl and abundance of nature set it apart from most capital cities in America. Tourists arrive via air or water, many coming in on cruise ships.