Korčula  is an island in the Adriatic Sea, in the Dubrovnik-Neretva county of Croatia. Korčula is also the name of the ancient fortified town on the protected east coast of the island. 
The walled old city, with streets arranged in a herringbone pattern allowing free circulation of air but protecting against strong winds, is tightly built on a promontory that guards the narrow sound between the island and the mainland. Building outside the walls was forbidden until the 18th century, and the wooden drawbridge was only replaced in 1863. All of Korčula's narrow streets are stepped with the notable exception of the street running alongside the southeastern wall, called the Street of Thoughts as one did not have to worry about the steps. The town includes several interesting historic sights: the central Roman Catholic cathedral of St Mark (built from 1301 to 1806), the 15th-century Franciscan monastery with its beautiful Venetian Gothic cloister, the civic council chambers, the palace of the former Venetian governors, grand 15th and 16th century palaces of the local merchant nobles, and the massive city fortifications.