Depart Dubrovnik on this full-day sightseeing tour of the island of Korčula and Ston, and discover one of the most prominent islands of the Adriatic and the second longest city wall in the world. En route, take in the panoramic scenery of the vineyards of the Pelješac peninsula, as well as some beautiful old country settlements. Stop at Ston to see the old salt flats. The town was a major fort of the Ragusan Republic, where the defensive walls were regarded as a notable feat of medieval architecture. The outer walls run a full 3 miles (5 kilometers), extending as far as Mali Ston on the northern side of the Pelješac isthmus. Continue to Korčula, a medieval fortified town on the oval peninsula that stretches deep into the Peljesac Channel. The town has two ancient entrances - Sea Gate, and Land Gate - and was built in the shape of a fish bone to reduce the impact of wind and sun. Wander the narrow streets, exploring sights such as Pjaceta Square, the Cathedral of St. Mark, and the Venetian Arsenal with its restored Tower Rampada. According to legend, Korčula is the birth place of Marco Polo, and you can also visit the house where he is thought to have been born.