If you find yourself in Rotterdam, there's a strong chance you've arrived by water. This popular port city (the second largest in the Netherlands) has gone through an architectural renaissance since World War II, with daring, innovative structures dotting the city (cube houses!) and defining its skyline. Café culture is on the rise here, so grab yourself a table and a cup.

Nestled on the banks of the Danube River, Vidin, Bulgaria, is a city where history and scenic beauty converge. This ancient city, known for its well-preserved medieval fortress, the Baba Vida Castle, offers a unique glimpse into Bulgaria's past. The fortress, dating back to the 10th century, stands as one of the best-preserved medieval fortifications in the country.

Marbella, located between the Mediterranean Sea and the Sierra Blanca mountains, is often associated with its luxury resorts and famous marina, Puerto Banús. But beyond the polished storefronts and designer yachts, the city has a layered past. Its old town, known as Casco Antiguo, is a well-preserved network of narrow streets built during Moorish rule, with whitewashed buildings, flower-filled balconies, and hidden plazas like Plaza de los Naranjos, which dates back to the 15th century.

Karlovy Vary, nestled in the west of the Czech Republic, is renowned for its therapeutic thermal springs and charming architecture. The town's spa heritage dates back to the 14th century when Charles IV, the Holy Roman Emperor, discovered the healing powers of its mineral waters. Today, Karlovy Vary continues to attract visitors seeking relaxation and wellness at its historic spa resorts, such as the luxurious Grandhotel Pupp, a hallmark of classic elegance source.

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.