When you come to the Old City of Dubrovnik, you must go to the city wall. The wall of Dubrovnik is the most perfect wall defense system in medieval Europe. It has never been attacked by the enemy. The entrance to the city wall is about 150RMB. There are three sections in the city wall walk. Each section must be inspected once. It takes about 3 hours to complete the journey. A person walks on the wall, quietly can only hear the sound of the sea. The red house and the Adriatic Sea are incomparably romantic. Tickets for city walls can also go to Fort Lovrjenac, but you can't enter at 4pm, if you are going to go early.