Aachen, Germany
Palo Alto, CA, USA
Bonn, Nordrhein-Westfalen, Germany
Maladzyechna, Minsk Region, Belarus
Düsseldorf, Nordrhein-Westfalen, Germany
Köln, Nordrhein-Westfalen, Germany
Moskva, Moskva, Russian Federation
Marburg, Hesse, Germany
Barcelona, Catalonia, Spain
Barcelona, Catalunya, Spain
Köln, Nordrein, +4