Bonn, Cologne, North Rhine-Westphalia, Germany Cologne, Cologne, North Rhine-Westphalia, Germany Aachen, Cologne, North Rhine-Westphalia, Germany Heimbach, Düren, Cologne, North Rhine-Westphalia, Germany Jülich, Cologne, North Rhine-Westphalia, Germany Odenthal, Cologne, North Rhine-Westphalia, Germany Wassenberg, Heinsberg, Cologne, North Rhine-Westphalia, Germany Bad Neuenahr-Ahrweiler, Ahrweiler, Cologne, North Rhine-Westphalia, Germany Kerpen, Rhein-Erft-Kreis, Cologne, North Rhine-Westphalia, Germany Jülich, Düren, Cologne, North Rhine-Westphalia, Germany