Erlangen, Germany
Barcelona, Catalonia, Spain
Den Haag, Zuid-Holland, Netherlands
Paris, Île-de-France, France
Houston, TX, USA
Helsinki, Uusimaa, Finland
New York, NY, USA
Düren, North Rhine-Westphalia, Germany
Capital Region of Denmark, Denmark
Enschede, Overijssel, Netherlands
Trembley, Geneva, Switzerland