Also known as the Croatian Athens, the UNESCO World Heritage–listed city of Dubrovnik certainly lives up to the accolade. The ancient city walls, with its myriad towers and turrets, date back to the 10th century and protect the many impressive monuments of the Old Town. Walking tours check off all the main sights including Onofrio's Fountain, the Franciscan Monastery and Museum, Dubrovnik Cathedral, Rector’s Palace, Renaissance-era Sponza Palace, the Church of St. Blaise, and of course, Dubrovnik’s Ancient City Walls. Beyond the Old Town, the city’s beaches and surrounding islands are popular with travelers and locals alike. Take a guided sea kayaking or snorkeling tour to discover caves and beaches along the Dalmatian coast. Or cruise by ferry, speedboat, replica 16th-century galleon, or even private yacht to the Elafiti Islands, Lokrum, Korcula Island (where Marco Polo was born), and more. For a true taste of Croatia, take a day trip to Konavle Valley region and spend the day hiking, biking, or wine tasting among the mountains, vineyards, villages, and olive groves. The Pelješac peninsula is also famed for its wine, and many excursions combine tastings in Pelješac with stops in the bayside town of Ston, known for its oysters and old salt factory. And for longer-haul trips, head to Bosnia and Herzegovina, where the town of Mostar dazzles all who gaze upon its iconic bridge, and Montenegro, the tiny country where medieval towns meet the natural beauty of fjords.