Siegen, Nordrhein-Westfalen, Germany
London, England, United Kingdom of Great Britain and Northern Ireland
Vienna, Austria
Samarkand, Samarkand, Uzbekistan
Saarbrücken, Saarland, Germany
Paris, Île-de-France, France
Dubna, Moscow region, Russian Federation
Istanbul, Istanbul, Turkey
Boston, MA, USA
Lausanne, Vaud, Switzerland