If you find yourself in Rotterdam, there's a strong chance you've arrived by water. This popular port city (the second largest in the Netherlands) has gone through an architectural renaissance since World War II, with daring, innovative structures dotting the city (cube houses!) and defining its skyline. Café culture is on the rise here, so grab yourself a table and a cup.

Catania, nestled on the eastern coast of Sicily, is a city shaped by fire and stone. Built from the black lava of Mount Etna, it’s a landscape filled with energy and contrasts from its Baroque palaces to its open air fish markets. At the heart of the city stands the Piazza del Duomo, where the iconic Fontana dell’Elefante, which is carved from volcanic rock, greets every visitor who passes by.

Uyuni, in southwestern Bolivia, is best known as the gateway to the world’s largest salt flat, Salar de Uyuni. Once a humble railway town, Uyuni has grown into a base for travelers drawn to this surreal landscape, where an ancient dried-up lake has left behind a vast expanse of glistening salt crust.

Greenland, the world’s largest island, offers travelers an experience that feels like stepping onto another planet. Vast ice sheets, towering glaciers, and deep fjords stretch across the horizon, creating a landscape that constantly shifts with the light. During summer, the Midnight Sun casts a golden glow well past midnight, while winter brings months of darkness lit by vibrant displays of the Northern Lights.

American Samoa consists of a group of seven islands in the southern Pacific Ocean, comprising Tutuila; the Manua group, consisting of Tau, Olosega, and Ofu; Aunuu; Rose Island; and Swains Island.