Cathedral of Saint Helena is the cathedral of the Roman Catholic Diocese of Helena , Montana . Modeled by architect A.O. Von Herbulis after the Votivkirche in Vienna , Austria , the construction began on the Cathedral in 1908 , and held its first mass in November 1914 . The Cathedral sustained significant damage during the 1935 Helena earthquake , which required extensive renovations . The Cathedral was added to the National Register of Historic Places in 1980
1935 Helena earthquake
1935 Helena earthquake
Cathedral of Saint Helena