6Dubrovnik, Croatia
Known as the “Pearl of the Adriatic,” Dubrovnik is a stunning medieval city perched on the coast of the Adriatic Sea. Founded in the 7th century, Dubrovnik boasts well-preserved city walls, medieval palaces, and baroque churches that have earned it UNESCO World Heritage status. Walk along the city walls for panoramic views of the red-roofed buildings and turquoise waters below, and explore the atmospheric streets of the old town, where every corner is steeped in history.