Coursing through 10 countries, the Danube is the second-longest river in Europe. This waterway, lined with fortresses and castles, rises in Germany's Black Forest and runs for 1,770 miles to the Black Sea. The Danube is an essential commercial thoroughfare for central and southeastern Europe, and several river cruise companies sail vessels on it year-round. Destinations along this river include Vienna, Budapest, Passau and Bratislava.

Glenfinnan, nestled in the Scottish Highlands, is a picturesque village renowned for its dramatic landscapes and historical significance. This small but enchanting destination is best known for the Glenfinnan Viaduct, an architectural marvel completed in 1901.

Jodhpur, often called the "Blue City" of India, is located on the edge of the Thar Desert in the state of Rajasthan. The city is famous for the blue-painted houses in its old quarter, which create a striking contrast against the golden hue of the desert landscape.

Rio Dulce is a river region in eastern Guatemala that connects Lake Izabal to the Caribbean Sea. The area is centered around the town of Fronteras and the long waterway that cuts through tropical forest, limestone cliffs, and wetland habitats.

San Sebastián, or Donostia, is a gem nestled on Spain's northern coast, renowned for its stunning beaches, world-class cuisine, and vibrant cultural scene. With its picturesque bay, La Concha, often ranked among the world's most beautiful city beaches, this Basque city offers a perfect blend of natural beauty and urban sophistication.