A rich experience awaits you in this wealthy, energetic and youthful Greek city. Revel in cosmopolitan pleasures: sophisticated shops and cafes, markets hidden away beyond historic city squares, and the superlative Archaeological Museum are but a few.

Stromboli is a small volcanic island in the Tyrrhenian Sea, just off the north coast of Sicily. Referred to by some as the "Lighthouse of the Mediterranean," Stromboli is in a constant state of mild volcanic activity, so don't venture out on a hike without an experienced guide.

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.

Libreville, the capital of Gabon, stretches along the Atlantic coast with a mix of modern streets, colonial-era buildings, and bustling markets.

Symi, a charming island in the Dodecanese, Greece, offers a picturesque escape with its striking neoclassical architecture and vibrant Mediterranean colors. The town of Symi, a designated protected cultural heritage site, is renowned for its beautifully preserved pastel-colored mansions that line the harbor.