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.

Warsaw stands as one of Europe’s most resilient cities, having rebuilt itself almost entirely after World War II. The Old Town, meticulously reconstructed using paintings by Italian artist Bernardo Bellotto, feels centuries old but is, in fact, less than a hundred years in its current form. Behind the medieval facades lie stories of uprisings, resistance, and quiet defiance. Visitors walking through Castle Square can enter the Royal Castle, where Poland’s Constitution of May 3, 1791 was adopted.

Newport News, independent industrial city, southeastern Virginia, at the mouth of the James River; incorporated as a city 1896. With nearby harbors it forms the Port of Hampton Roads, one of the principal commercial ports in the U.S.

Sintra, located just 40 minutes from Lisbon, feels like a world apart. Tucked into the hills of the Serra de Sintra, this town has drawn kings, poets, and explorers for centuries. It was once the summer retreat of Portuguese royalty, who left behind palaces and gardens that seem pulled from a storybook. The most famous, Palácio da Pena, is perched high above the town with bold red and yellow towers that blend Romanticism with Moorish and Gothic styles.

Vieques Island is found in the northeastern Caribbean, roughly 8 miles east of the Puerto Rican mainland. Its beaches are commonly acknowledged as some of the Caribbean's best. The Bioluminescent Bay is especially alluring given the undeveloped nature of the island.