Elvas rises from the Alentejo plains near the Spanish border as one of Portugal’s most striking fortified towns, shaped by centuries of defense, resilience, and daily life along the frontier. Encircled by an immense network of walls, bastions, and hilltop forts, the town tells a clear story of strategy and survival, from the sweeping views at Forte da Graça to the quiet streets within the historic center.

Culloden, located just outside Inverness in the Scottish Highlands, is the site of one of the most significant and sobering moments in Scotland’s history. On April 16, 1746, the Battle of Culloden marked the violent end of the Jacobite uprising led by Charles Edward Stuart, better known as Bonnie Prince Charlie. In under an hour, the hopes of restoring the Stuart monarchy were crushed by government forces.

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.

Algiers is the capital and largest city of Algeria, occupying a series of hills along the western side of a broad Mediterranean bay. Its landscape combines a historic hillside core, modern districts, busy avenues, and a large waterfront. The white facades of the city rise above the sea, giving Algiers its familiar nickname, “Algiers the White.”

Isla del Sol, or Island of the Sun, is one of the best-known islands in Lake Titicaca, Bolivia, located in the lake’s southern section near Copacabana. The island is shaped by steep hills, stone terraces, small farming communities, and broad views across the high-altitude lake toward the Andes. At about 3,810 meters above sea level, Lake Titicaca creates a distinctive setting where cultivated slopes meet deep blue water and distant mountain peaks.