Wrocław, Województwo dolnośląskie, Poland
Berlin, Berlin, Germany
Cologne, North Rhine-Westphalia, Germany
Essen, North Rhine-Westphalia, Germany
Hallungen, Thüringen, Germany
Muelheim an der Ruhr, North Rhine-Westphalia, Germany
Seoul, Seoul, Korea (Republic of)
Dortmund, North Rhine-Westphalia, Germany