Tour of City Walls and Old Town Dubrovnik city wall is a 2 km long boundary, built for defensive purpose and encloses the old town of Dubrovnik. What’s better than starting your day by touring around the city wall. The wall area encompasses 17 towers, St. John Fort, 5 bastons and 2 corner forts and is considered as one of the best things to do in Dubrovnik, if you wish to have a fair idea of how the historic city looks like.