Klagenfurt Cathedral
Klagenfurt am Wörthersee, Austria · built 1571
Klagenfurt Cathedral (Klagenfurter Dom, Dom- und Stadtpfarrkirche Hll. Petrus und Paulus) is the cathedral of the Roman Catholic Diocese of Gurk-Klagenfurt and the main parish church of Klagenfurt. It was built by Protestants and dedicated to the Holy Trinity in 1581. It was the largest Protestant church in Austria at that time.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).