A tributary of the Rhine, the Moselle River flows through France, Luxembourg and Germany. The Moselle also lends its name to a region of France, a valley which it bisects, and a wine produced along its banks.

Lake Tana, located in the northwest of Ethiopia, is the country’s largest freshwater lake and the source of the Blue Nile. Its calm waters are dotted with more than 30 islands, many of which are home to ancient monasteries adorned with religious paintings and manuscripts.

Saudi Arabia is revealing chapters long unseen by tourists. Al-Ula is home to Hegra, the first UNESCO World Heritage Site in the kingdom and hosts to ancient Nabatean tombs carved in sandstone cliffs. Nearby, the mirrored Maraya Concert Hall reflects the desert sky, its design both unexpected and elegant amid the sands. Visitors can wander through narrow canyons, step inside rock-hewn facades, and feel the weight of ancient civilizations still echoing across the dunes.

Originating as a tiny fishing village in 1038, modern Kehl has become an important link between Germany and France. Rhine River cruises most often use Kehl as their gateway to the much larger and better-known Strasbourg. The savvy traveler, though, might choose to skip the jaunt across the river and enjoy many similar sights, shopping and cuisine as those offered in the teeming French city.

Three hours north of Auckland, a chain of verdant islands meet glittering turquoise waters in the Bay of Islands. This subtropical paradise will astound you with its abundance of natural beauty and marine life. Sail to the Bay of Islands, and you'll find plenty to see and explore. Hike to stunning Rainbow Falls, kayak along the shores of New Zealand's lush coastline, and keep an eye out for whales, dolphins, penguins, and a variety of colorful parrots.