old city of Trogir is a UNESCO World Heritage Site and contains a mixture of influence from the Hellenistic period, Romans, and Venetians with its Greek architecture, Romanesque churches, Renaissance and Baroque buildings. Trogir is the best-preserved Romanesque-Gothic complex in Central Europe. Trogir's medieval core, surrounded by walls, comprises a preserved castle and tower and a series of dwellings and palaces from the Romanesque, Gothic, Renaissance and Baroque periods. Trogir's grandest building is the Cathedral of St. Lawrence, whose main west portal is a masterpiece by Radovan, and the most significant work of the Romanesque-Gothic style in Croatia. Another notable attraction is the Kamerlengo Castle. Dubrovnik One of the best-known Croatian tourist sites is the fortified city of Dubrovnik with its Renaissance culture. The highlight is the Sponza Palace which dates from the 16th century and is currently used to house the National Archives. The Rector's Palace is a Gothic-Renaissance structure that now houses a museum. Its façade is depicted on the reverse of the Croatian 50 kuna banknote, issued in 1993 and 2002. The St. Saviour Church is another remnant of the Renaissance period, next to the Franciscan Monastery. The Franciscan monastery's library possesses 30,000 volumes, 22 incunabula, 1,500 valuable handwritten documents. Exhibits include a 15th-century silver-gilt cross and silver thurible, an 18th-century crucifix from Jerusalem, a martyrology (1541) by Bernardin Gučetić and illuminated Psalters. Dubrovnik's most famous church is St Blaise's Church, built in the 18th century in honor of Dubrovnik's patron saint. Dubrovnik's baroque Cathedral houses relics of Saint Blaise. The city's Dominican Monastery resembles a fortress on the outside but the interior contains an art museum and a Gothic-Romanesque church. A treasure of the Dominican monastery is its library with over 220 incunabula, numerous illustrated manuscripts, a rich archive with manuscripts and documents and an extensive art collection. The main feature of Dubrovnik is its walls that run 2 km around the city. The walls run from four to six metres thick on the landward side but are thinner on the seaward side. The system of turrets and towers were intended to protect the city. An excursion along the coast south of Dubrovnik to the area of Ljuta offers daytime cruise excursions with scenic views including water streams, historic water mills and the mountain range east of the coastal plateau. Just off the coast of Dubrovnik is the forested island of Lokrum. The small island has