Aachen vs Oldenburg

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Aachen (, German: [ˈʔaːxn̩] (listen); Aachen dialect: Oche [ˈɔːxə]), also known as Bad Aachen ("Aachen Spa"), in Dutch as Aken, in French as Aix-la-Chapelle, in Italian as Aquisgrana, and in Latin as Aquæ Granni, is a spa and border city in North Rhine-Westphalia, Germany. Aachen developed from a Roman settlement and spa, subsequently becoming the preferred medieval Imperial residence of Emperor Charlemagne of the Frankish Empire, 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 of Cologne in a former coal-mining area. One of Germany's leading institutes of higher education in technology, the 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.

Source: Wikipedia