Karlsruhe, Baden-Württemberg, Germany
Berlin, Berlin, Germany
Aachen, North Rhine-Westphalia, Germany
Hamburg, Hamburg, Germany
Yerevan, Yerevan, Armenia
Vladimir, Vladimir Oblast, Russian Federation
Rheinbach, Nordrhein-Westfalen, Germany
Wiesbaden, Germany
Moscow, Moscow, Russian Federation
Prague, Prague, Czech Republic
