Dubrovnik is the port city in Croatia located on the Adriatic Sea. Defensive walls from the 14th century, which are 2 km long, are characteristic for the city. They were rebuilt several times and they measure up to 25 m of height and are up to 6 m thick. Dubrovnik is one of the most beautiful cities of Croatia, which is confirmed by plenty of tourists visiting this city. In picturesque, narrow streets there are many shops and restaurants. What is more, the city is full of architectural historic monuments, among them the St. John’s fortress, from which there is a beautiful view on the city.