Walled cities are urban areas that are surrounded by defensive walls, originally built for protection against invasions and attacks. These walls often include gates and towers, serving both as fortifications and as symbols of power. Many walled cities date back to ancient times and can be found in various parts of the world, showcasing unique architectural styles and historical significance. Today, some walled cities, like Carcassonne in France and Dubrovnik in Croatia, are popular tourist destinations. They offer visitors a glimpse into the past, with well-preserved structures and narrow streets that reflect their historical importance. These cities often host cultural events and festivals, celebrating their rich heritage.