The old town of Korčula is surrounded by walls, and the streets are arranged in a herringbone pattern allowing free circulation of air but protecting against strong winds. Korčula 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. The street is called the Street of Thoughts as one did not have to worry about the steps.
The town's historic sites include the central Romanesque-Gothic Cathedral of St Mark (built from 1301 to 1806), the 15th-century Franciscan monastery with a 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.
Cursola, as it was called in Latin, became an episcopal see in the early 14th century, when the bishop of Ston asked to be authorized to transfer his seat there because of Serb pressure on Ston. This was granted and he was made bishop also of a new diocese of Cursola united with his previous one. In 1541, the Ragusans asked for the separation of ecclesiastical jurisdiction over Ston, which they had conquered, from Cursola, which in the previous century had become a Venetian possession. In 1828, when both the Korčula and Ragusa (Dubrovnik) belonged to the Austrian Empire, the territory of the diocese of Cursola was made part of that of Dubrovnik. No longer a residential bishopric, Cursola is today listed by the Catholic Church as a titular see.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.