Ingolstadt is a city in the Free State of Bavaria, in the Federal Republic of Germany. It is located along the banks of the River Danube, in the centre of Bavaria., Ingolstadt had 131,002 citizens. It is part of the Munich Metropolitan Area, which has a total population of more than 5 million. The Illuminati, a Bavarian secret society, was founded in Ingolstadt in the late 18th century. Ingolstadt is a setting in the novel Frankenstein by Mary Shelley, where the scientist Victor Frankenstein creates his monster. It is the site of the headquarters of the German automobile manufacturer Audi, defence aircraft manufacturer Airbus, and electronic stores Media Markt and Saturn. Ingolstadt Central Station has been connected to Nuremberg by a high-speed rail link since May 2006. Ingolstadt also has a second passenger station at Ingolstadt Nord.