The cathedral of St Nicholas, dedicated to the patron of sailors, was built in the thirteenth century. The contemporary church, built according to plans by architect Andrea Pozzo and decorated with frescoes by Giulio Quaglio, began to be built in 1701. The dome was added in 1841 by Slovenian architect Gregor Macek, and painted by Langus Matevž between 1843 and 1844. You can still see some remains of the former church which once stood here. The Slovenian sculptor Mirsad Begic sculpted a contemporary history of the Diocese of Ljubljana in the side door of the cathedral bronze in honor of the Pope's visit to Ljubljana in 1996.