The 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.