Zanzibar Island, off the coast of Tanzania, is a captivating destination where history and natural beauty converge. The island’s Stone Town, a UNESCO World Heritage Site, is a maze of narrow alleys, vibrant markets, and historical buildings. Wander through the bustling Darajani Market, where local spices, textiles, and crafts create a sensory feast.

Replete with windmills and old-world charm, the village of Kinderdijk lies east of Rotterdam on the Lek River and is a popular stop for European river cruises. Home to the largest concentration of old windmills in the Netherlands, Kinderdijk was designated a UNESCO World Heritage Site in 1997.

Located in western Austria, Innsbruck is a charming European destination on the banks of the Inn River. A popular stop for skiing, Innsbruck is nestled within the Alps and offers a variety of cable cars to whisk you to the mountains for outdoor sports and spectacular views of the Innsbruck below.

Hidden in the northern region of Costa Rica, the Celeste River (Río Celeste) winds through Tenorio Volcano National Park with a color so vivid it seems unreal. The river’s striking turquoise hue is caused by a natural chemical reaction between two mineral-rich streams, Quebrada Agria and Río Buena Vista, which merge at a point known as "El Teñidero." This one-of-a-kind phenomenon creates the illusion that the water has been dyed blue, even though no pigments are present.

Long regarded as one of the freest-thinking college towns in the U.S., Ann Arbor is home to the University of Michigan, the Gerald R. Ford Presidential Library and Domino's Pizza. While you're in Ann Arbor, be certain to see the city's many fascinating historic buildings; the Kelsey Museum of Ancient and Medieval Archaeology; and Kerrytown (a diversity of specialty shops and eateries in restored 19th-century buildings close to the Farmers Market).