Belgrade, Central Serbia, Serbia
Tartu, Tartu County, Estonia
Karvina, Czech Republic, Czechia
Aachen, North Rhine-Westphalia, Germany
Ankara, Turkey
Berlin, Germany
Copenhagen, Denmark
Thessaloniki, Decentralized Administration of Macedonia and Thrace, Greece
Samos, Greece
Barcelona, Catalonia, Spain
Izmir, Izmir, Turkey
Hamburg, Hamburg, Germany
