Opatija, located on Croatia’s Kvarner Bay, has been drawing visitors since the 19th century, when Austro-Hungarian aristocrats built grand villas along its Adriatic shoreline. Today, many of those same buildings still stand with some restored as luxury hotels and others preserved as cultural landmarks. The town’s most recognizable structure, Villa Angiolina, opened in 1844 and marked the start of Opatija’s rise as a fashionable seaside resort.

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).

Las Vegas, Nevada, is an electrifying city where glitz and glamour meet entertainment and excitement. Known as "The Entertainment Capital of the World," Las Vegas offers an unparalleled array of attractions, from its iconic casinos and luxurious hotels to its world-class dining and live shows. The city's entertainment scene is second to none, featuring legendary headliners, cutting-edge performances, and an array of themed attractions.

Arches National Park, located in eastern Utah, is a mesmerizing landscape filled with more than 2,000 natural stone arches, pinnacles, and balanced rocks sculpted by centuries of wind and water erosion. One of the most iconic landmarks is Delicate Arch, a freestanding red rock formation that has become a symbol of Utah itself.

The Elbe is one of the Central Europe's greatest rivers, rising in the northern Czech Republic, traversing through Bohemia and Germany, and flowing into the North Sea not far from Hamburg. The river and its route have been largely untouched, so wildlife visibly abounds along its wetlands and wooded regions. Other scenery includes terraced vineyards and charming wine villages.