Dubrovnik city Walls are 1940 meters long with forts, towers and bastions encircling whole city. For sure, visiting City Walls is best way to understand and explore Dubrovnik.
Rector’s pallace and Sponza Palace are gothic-renaissance style buildings with great importance during Dubrovnik Republic.
Sponza was custom house, warehouse and mint of Dubrovnik Republic coins. Today it’s historical archive with big importance for Croatia and neihgbouring countries. Rector’s palace was seat of Dubrovnik goverment and Rector in medieval Dubrovnik. New Rector was elected each month, as Dubrovnik people understood, is period long enough that rulling power will not be misused.
Gothic-renaissance Dominican Monastery has rich collection of Dubrovnik School painters of 15th and 16th century and Franciscan monastery Pharmacies is one of the oldest in Europe, dating from 14th century.
Dubrovnik Cathedral has treasury with saint reliquaries.
Dubrovnik is protected by UNESCO.
What else to see around Dubrovnik?
Beside exploring mentioned historical sights I suggest you visiting Island of Lokrum (15 minute by ship from an Old City Harbour).
Interesting archipelago close to Dubrovnik are Elaphite Islands.
The largest (best know) islands are Lopud, Sipan and Kolocep. Lopud’s my favourite because of beautiful sandy beach. Elaphite Islands may be reached by Jadrolinija and Nova Agency ships from the main harbour in Gruz or by Nova Agency from Dubrovnik Old City and Cavtat.
By road, you easily (20 minutes drive) reach Cavtat in Konavle area (eastern from Dubrovnik). Cavtat is picturesque town and small port founded by the Greeks and was a colony during Roman empire.
60 km West from Dubrovnik is peninsula of Peljesacknown by famous red vines as Dingac and Plavac.
Place called “Mali Ston” at the beggining of peninsula offers you fresh sea food and there are grown one of the best kind of oysters and mussels in Europe.
Ston has salt production pools and other faccilities, which are almost unchanged since medieval times, when it was part of Dubrovnik Republic. Because of gret value of salt, Ston was protected by 5,5 km long walls, Ston walls are called Chinese Wall of Europe.
Not far from Ston is nice sandy beach of Prapratno with touristic camp.
If you stay longer, you may take daily excursion to Island of Korcula (born place of Marco Polo explorer) and Island of Mljet (known by National Park with interconnected lakes inside the Island).
From Dubrovnik you may easily visit another country beside Croatia, visit Mostar in Bosnia and Herzegovinia, city with an old turkish bridge or visit Montenegro coast where cities of Kotor and Budva and island of “Sveti Stefan”are the most interesting places.