Khartoum, the capital of Sudan, sits where the Blue and White Nile rivers meet, creating a unique landscape of waterways, islands, and riverbanks.

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.

Located in northwest England, Birmingham has a tremendous history as an industrial city. Close to coal and iron ore supplies, it was here that Bouton and Watt harnessed steam power to run machinery. The Museum of Science and Industry resides here and provides an excellent look at England's history.

Potosí rises on the Altiplano of southern Bolivia and for centuries it was one of the richest cities in the world because of what lies just beyond its streets. At the foot of Cerro Rico (“Rich Mountain”), silver was discovered in the mid-1500s, and within a few decades the city became a center of mining and wealth that shaped global trade and economies.

Veracruz, Mexico, is a vibrant port city rich in history and culture. Founded in 1519 by Hernán Cortés, it is Mexico’s oldest city, and its historic center, with its colorful colonial buildings and bustling Zócalo, reflects its deep historical roots. Visitors can explore the impressive San Juan de Ulúa Fortress, a massive colonial-era fort that once served as a prison and a key military base.