1. The Aldermaston march, April 1958 (Bentley Archive/Popperfoto/Getty Images)
2. Checkpoint Charlie, Berlin, 1953 (PhotoQuest/Getty Images)
3. Konrad Adenanauer and Robert Schuman, 1951 (AFP/Getty Images)
4. Crowds at Stalin’s funeral, 1953 (Keystone-France/Gamma-Keystone via Getty Images)
5. President Tito and Nikita Khrushchev in Belgade, 1963 (Keystone/Hulton Archive/Getty Images)
6. Soviet tank destroyed in the Hungarian uprising of 1956 (Sovfoto/UIG/Getty Images)
7. Algerian Harkis arriving in France, 1962 (STF/AFP/Getty Images)
8. Simone de Beauvoir and Jean-Paul Sartre in Rome, 1963 (Keystone-France/Gamma-Keystone via Getty Images)
9. Little Richard on tour in Germany, 1962 (Siegfried Loch – K & K/Getty Images)
10. Carnaby Street, London (Jean-Philippe Charbonnier/Gamma-Rapho/Getty Images)
11. Citroën showroom, Paris (Charles Edridge/Getty Images)
12. Students and police in Paris, May 1968 (Hulton-Deutsch/Corbis via Getty Images)
13. Leonid Brezhnev and Alexander Dubček in Bratislava, 1968 (Keystone-France/Gamma-Keystone via Getty Images)
14. Invasion of Czechoslovakia, 1968 (Popperfoto/Getty Images)
15. Willy Brandt in Warsaw, 1970 (Bettmann/Getty Images)
16. Swiss anti-women’s vote poster, 1971 (Swiss National Museum, Zürich)
17. Workers’ demonstration, Lisbon, May 1974 (Hervé Gloaguen/Gamma-Rapho via Getty Images)
18. Turks in Duisburg, 1980 (Henning Christoph/Ullstein Bild via Getty Images)
19. IRA bombing in Belfast, 1972 (Bettmann/Getty Images)
20. Pope John Paul II in Warsaw, 1979 (Bettmann/Getty Images)
21. Lech Wałęsa at the Gdansk shipyard, 1980 (Jean-Louis Atlan/Sygma via Getty Images)
22. François Mitterrand and Helmut Kohl, 1984 (Régis Bossu/Sygma via Getty Images)
23. Margaret Thatcher and Mikhail Gorbachev in Moscow, 1987 (Georges De Keerle/Hulton Archive/Getty Images)
24. Leipzig demonstration, 1989 (Georges Merillon/Gamma-Rapho via Getty Images)
25. Romanian demonstrator, Bucharest, 1989 (Peter Turnley/Corbis/VCG via Getty Images)
26. Anti-Maastricht placards, Provence, 1992 (Philippe Giraud/Sygma via Getty Images)
27. Bombing of Sarajevo, 1992 (Georges Gobet/AFP/Getty Images)
28. Boris Yeltsin and Vladimir Putin, 1999 (AFP/Getty Images)
29. Aftermath of the Madrid train bombing, 2004 (Pool Almagro/Duclos/Vandeville/Gamma-Rapho via Getty Images)
30. General strike in Athens, 2010 (Milos Bicanski/Getty Images)
31. Pro-Europe demonstration in Ukraine, New Year’s Eve, 2013/14 (Sergei Supinsky/AFP/Getty Images)
32. Turkish policeman with the body of Aylan Shenu, 2015 (Nilufer Demir/Dogan News Agency/AFP/Getty Images)