What cities are behind the iron curtain?

The term "Iron Curtain" historically refers to the ideological and physical division between Western capitalist countries and Eastern communist countries during the Cold War. Cities behind the Iron Curtain included major urban centers in Eastern Europe, such as East Berlin, Warsaw, Prague, Budapest, and Bucharest. These cities were part of the Eastern Bloc, influenced or controlled by the Soviet Union, and were characterized by authoritarian regimes and limited freedoms compared to their Western counterparts.