Oberhausen, North Rhine-Westphalia, Germany
Asuncion, Asuncion Capital District, Paraguay
Barcelona, Catalunya, Spain
Leipzig, Saxony, Germany
Montreal, Quebec, Canada
Rostock, Mecklenburg-Vorpommern, Germany
Clausthal-Zellerfeld, Lower Saxony, Germany
Tunis, Tunis, Tunisia
Muenster, North Rhine-Westphalia, Germany
Aachen, North Rhine-Westphalia, Germany
Wuxi, Jiangsu, China
Vaihingen an der Enz, Baden-Württemberg, Germany