Aachen or Bad Aachen, traditionally known in English and French as Aix-la-Chapelle, is a spa and border city in North Rhine-Westphalia, Germany. Aachen was the preferred residence of Charlemagne, and, from 936 to 1531, the place where 31 Holy Roman Emperors were crowned Kings of the Germans.
Aachen is the westernmost city in Germany, located near the borders with Belgium and the Netherlands, 61 km (38 mi) west south west of Cologne in a former coal-mining area. RWTH Aachen University is located in the city. Aachen's industries include science, engineering and information technology. In 2009, Aachen was ranked eighth among cities in Germany for innovation.