St. Mark's Cathedral is the former cathedral of a diocese that was abolished in 1828. The cathedral was built in 1407 and a chapel was added along the north nave in 1525, giving the impression of a fourth nave with its columns and arches. Subsequent interventions, mainly in the late Baroque style, modified the original appearance of the cathedral, in the Gothic-Renaissance style.
The Dominican Monastery of St. Nicholas was probably built in the 16th century. The building was seized by the Russians and Montenegrins in 1808. In 1813, the English returned the church and monastery to the Dominicans who occupied it, but it remained closed due to the shortage of monks. It was not until 1844 that the monks returned to the monastery.
The Serbian Orthodox Church of the Holy Annunciation was built in 1877. The church has an important collection of icons, some of them dating from the 15th and 16th centuries. The church survived damage from bombing during the Siege of Dubrovnik in 1991. Restorations were done in 2009.