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

Warnemunde (or Warnemünde) is a port city in Germany and a frequent stop on many Northern European cruises. Across the Baltic Sea from Denmark's capital, Copenhagen, this charming seaside city has a number of delightful attractions, including the Warnemünde Lighthouse, a variety of local shops along the marina, and surfing lessons on the beach.

Nuevo Vallarta, located along the Bahía de Banderas in the state of Nayarit, is a coastal destination known for its wide, sandy beaches and marina-lined canals. Originally developed as a tourism project in the late 20th century, it has grown into a well-organized resort area with luxury hotels, golf courses, and waterfront condos. Unlike older beach towns with colonial roots, Nuevo Vallarta was designed from the start to offer modern comfort while being surrounded by natural landscapes.

Doubtful Fjord (Doubtful Sound) is a large fjord in southwestern New Zealand, in the same region as the smaller but better known Milford Sound. It is home to an unusually large population of bottlenose dolphins, as well as a variety of birds, fur seals, penguins, and often even humpback whales.

Kinshasa, the capital of the Democratic Republic of the Congo, is one of Africa’s most vibrant and unpredictable cities. Sprawling along the banks of the Congo River, it’s the third-largest city on the continent and pulses with music, art, and personality at every turn. Across the river lies Brazzaville, making Kinshasa part of the only pair of national capitals facing each other across a single waterway.