V. I. Lenin and Yakov M. Sverdlov looking over just unveiled Marx and Engels Monument on Voskresensky Square (now Revolution Square) in Moscow, November 7, 1918.
Tsar Nicholas II of Russia with members of his family in the private grounds of Tsarskoe Selo, 1916. (L-R) Aide-de-camp Sablin, Tsar Nicholas II, the Grand Duchesses Tatiana, Olga, Maria, Anastasia and Tsarevich Alexei. In front of Maria is Prince Vasili, behind her are the Princes Nikita, Rostislav and Dmitri.
Photograph of participants of the first Solvay Conference, in 1911, Brussels, Belgium. Seated (L-R): Walther Nernst, Marcel Brillouin, Ernest Solvay (he wasn't present when the above group photo was taken; his portrait was crudely pasted on before the picture was released), Hendrik Lorentz, Emil Warburg, Jean Baptiste Perrin, Wilhelm Wien, Marie Skłodowska-Curie, and Henri Poincaré. Standing (L-R): Robert Goldschmidt, Max Planck, Heinrich Rubens, Arnold Sommerfeld, Frederick Lindemann, Maurice de Broglie, Martin Knudsen, Friedrich Hasenöhrl, Georges Hostelet, Edouard Herzen, James Hopwood Jeans, Ernest Rutherford, Heike Kamerlingh Onnes, Albert Einstein, and Paul Langevin.
Members of the white supremacist movement, the Ku Klux Klan standing by an aeroplane, out of which they dropped publicity leaflets over Washington, USA, 1922.
There was a lot of tension during the Cuban missile crisis, so much so that the US Army deployed anti-aircraft Hawk missiles on a Florida beach in Key West. Photo was taken October 27, 1962.