Mannheim, Baden-Württemberg, Germany
Aachen, North Rhine-Westphalia, Germany
Hamburg, Germany
Cambridge, Cambridgeshire, United Kingdom of Great Britain and Northern Ireland
Riga, Riga, Latvia
Trier, Rhineland-Palatinate, Germany
Horsens, Central Denmark Region, Denmark
Darmstadt, Hesse, Germany
Gothenburg, Västra Götaland County, Sweden
Lichtenstein, Baden-Württemberg, Germany
Freiburg im Breisgau, Baden-Wuerttemberg, Germany
Barcelona, Catalonia, Spain
