Capri, a jewel of the Tyrrhenian Sea, has long been a favorite retreat for emperors, artists, and writers. This enchanting island off Italy's Amalfi Coast captivates with its dramatic cliffs, turquoise waters, and timeless elegance. The most iconic sight on Capri is the Blue Grotto, a sea cave illuminated by a magical blue light created by sunlight passing through an underwater cavity.

Piombino is a coastal city on a promontory in southern Tuscany, overlooking the Tyrrhenian Sea and the islands of the Tuscan Archipelago. Its position on the Etruscan Coast has shaped both its history and its modern identity, with a working port, maritime traditions, and access to beaches and protected coastal areas. The historic center occupies the older part of the promontory, where medieval and Renaissance buildings stand within sections of the former defensive walls.

St. Vincent & the Grenadines is a Caribbean nation that feels both adventurous and serene, a chain of lush islands and tiny cays scattered across turquoise waters. The main island of St. Vincent is dominated by volcanic landscapes, including the active La Soufrière volcano, whose slopes are covered in rainforest and dotted with waterfalls.

The Cook Islands, a group of 15 islands scattered across the South Pacific, offer a rare blend of Polynesian tradition and laid-back island charm. Rarotonga, the largest and most visited island, is ringed by a turquoise lagoon and backed by lush mountains. Visitors can circle the entire island in under an hour, stopping along the way for fresh coconut, beachside cafés, or a quick swim in the clear lagoon.

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.