Aachen, North Rhine-Westphalia, Germany
Ulaanbaatar, Ulaanbaatar, Mongolia
Freiburg im Breisgau, Baden-Württemberg, Germany
Göttingen, Niedersachsen, Germany
Karlsruhe, Baden-Württemberg, Germany
Kraków, Lesser Poland Voivodeship, Poland
Groningen, Groningen, Netherlands