Haus der Industrie is the seat of Federation of industrialists which makes it one of the most important buildings in Austria. Constructed between 1906 to 1909, it has immense historical significance attached to it and was designed by the renowned architect Karl König. The interiors are nothing short of spectacular and its large-scale grandeur is awe-inspiring. Its fest hall is one of the largest in the city and hosts a number of classical concerts from time to time.