The Cathedral of St. James in Šibenik is one of the most significant and most beautiful architectural achievements in Croatia and was included on the UNESCO Cultural World Heritage List in 2000. It was built in a stretch of more than a hundred years, during the 15th and 16th century, and is unique for it is entirely built of stone. The most important builders of the Cathedral were Juraj Dalmatinac (Georgius Mathei Dalmaticus) and Nikola Firentinac (Niccolò di Giovanni Fiorentino). The Cathedral was first built in Gothic, and completed in Renaissance style https://www.sibenik-tourism.hr/lokacije/cathedral-of%20-st-james/1/en.html

A small church of St. George used to be situated where the Church of St. Euphemia is located today. When St. Euphemia's sarcophagus was brought to Rovinj, the Church of St. George became too small for all the pilgrims. In the 10th century, the people of Rovinj started building a new, bigger church. It was a three-nave church with three projected apses and wooden statues of St. George and St. Euphemia. At the beginning of the 17th century, a new gold-plated stone statue was erected which until this day remains on the altar of the Saint. The church itself required with time more and more reparations, and the town population grew so that the people of Rovinj decided to build an even bigger church. The building process started in 1725 and lasted until 1736. Three main altars were built in 1741, and the organ was installed in 1754. The façade was designed and built in the second half of the 19th century. Many altars and paintings enrich and embellish the church from within. https://www.inforovinj.com/eng/rovinj/znamenje/crkva-sv-eufemija.asp

The Church of St. Peter and St. Paul is the co-cathedral of the Roman Catholic Archdiocese of Đakovo-Osijek. A co-cathedral is a cathedral church which shares the function of being a bishop’s seat, or cathedral, with another cathedral, often in another city. http://croatia4me.com/en/travel-directory/co-cathedral-of-sts-peter-and-paul-in-osijek/