One of the major rivers of the Iberian Peninsula, the Douro in north-central Spain and Portugal just might be the world's most beautiful wine region. Most of the river on the Spanish side isn't navigable, so river cruises generally travel roundtrip from Porto, on the coast of the Atlantic.

Dikili leads the way to the ancient city of Pergamum, also known as Bergma. This city thrived under the Romans from the 2nd century BC to the 2nd century AD. One of the most fascinating aspects of the ancient site is the medical complex, Asklepieon, where advanced psychological treatments were practiced.

Beaches, margaritas and relaxed vibes are all part of visiting the island city of Key West, where summer never ends.

West of Vienna, the quaint town of Dürnstein lies on the banks of the iconic Danube and is the perfect destination for river cruising, sightseeing, and enjoying the best of Austrian culture. Though small, this picturesque village offers plenty to see and do.

Motril, Spain, is located near the Guadalfeo River on the Mediterranean coast in the province of Granada. Sugar cane refineries form the backbone of Motril's economy, though tourism is also an essential industry.

Nestled on the northern coast of Iceland's Snæfellsnes Peninsula, Stykkishólmur is a charming coastal town known for its scenic beauty and maritime heritage. Often referred to as the gateway to the Westfjords, Stykkishólmur is the ideal base for exploring the stunning landscapes of this less-traveled part of Iceland. The town's picturesque harbor, lined with colorful houses and fishing boats, offers a quintessential Icelandic coastal experience.