Center of Tirana, People's Socialist Republic of Albania, 1978 (photo by Robert Schediwy)

Lenin in one of the committees of the II Congress of the Comintern, Moscow, 1920

'Supporting Engels in writing Anti-Dühring', painting by Ding Yilin, China, 2018

Budapest in the morning, Hungary, 1968

New houses in Ulaanbaatar built according to designs by Bulgarian architects, Mongolia, 1964

“Comrade Stalin”, sketch by Tao Lengyue, 1955

Erich Honecker during a meeting of the party leaders of the socialist states in Crimea in 1973

Residential complex at Grunwaldzki Square in Wrocław, Poland, 1982 (photo by Chris Niedenthal)

Assembly of the Karl Marx Monument in Karl-Marx-Stadt, GDR, 1971

Parade in honor of the 40th anniversary of victory over fascism, Belgrade, Yugoslavia, 1985

Housing in the ninth district of Budapest, Hungary, 1966 (photo by Domonkos Endre)

'Sükhbaatar visiting Lenin', painting by Kondraty Petrovich Belov, 1921

People at the Marx Engels Monument in Berlin, GDR, 1986 (photo by Ulrich Berger)

'The Soviet-Czechoslovak crew', painting by Boris Okorokov, 1978

Kliment Voroshilov and Mao Zedong, chinese poster, 1957

'A condom protects against infection with sexually transmitted diseases', polish poster, 1978

Fidel Castro during a baseball match, 1964

Family rides the “Troll” scooter, GDR, 1964

'For Motherland - For Socialism!', czechoslovak poster, 1953

Georgy Zhukov, Minister of Defense of the USSR, General Marian Spychalski, Minister of Defense of Poland, and Wladyslaw Gomulka, Prime Secretary of the Central Committee meet in Warsaw on December 17, 1956, before the signing of the Soviet-Polish Agreement