The Stadttheater Klagenfurt is the state theater for Carinthia and Carinthia's largest cultural institution. It is located in the three-country Alpe-Adria region (Austria, Slovenia, Italy) and is the southernmost theater in the German-speaking area. Built between 1908 and 1910 by the legendary architects Helmer & Fellner in the free Empire style, the city theater celebrated its centenary in 2010.