MEP3064124: Wawel Castle, Poland, 2015 (photo) / Bridgeman Images

SZT2992048: Alfred Hugenberg, 1931 (b/w photo) / Bridgeman Images

SZT2992066: A soldier of the Waffen SS takes a food break, 1942 (b/w photo) / Bridgeman Images

SZT2992096: Mahatma Gandhi gives Mrs. Perin directions shortly before his arrest, 1932 (b/w photo) / Bridgeman Images

SZT2992105: Police cautions a woman, 1913 (b/w photo) / Bridgeman Images

SZT2992108: Police learn how to send telegraphs, 1911 (b/w photo) / Bridgeman Images

SZT2992126: Italian Carabinieri (b/w photo) / Bridgeman Images

SZT2992129: Lesson in a police academy, 1931 (b/w photo) / Bridgeman Images

SZT2992162: Police troop in parade uniform, 1935 (b/w photo) / Bridgeman Images

SZT2992174: Traffic policeman in Munich, 1929 (b/w photo) / Bridgeman Images

SZT2992177: Traffic control on the highway, 1937 (b/w photo) / Bridgeman Images

SZT2992180: Austen Chamberlain on the terrace of the Palace of Nations, 1926 (b/w photo) / Bridgeman Images

SZT2992192: Parking lot in Berlin, 1927 (b/w photo) / Bridgeman Images

SZT2992198: President Calvin J. Coolidge in Chicago, 1927 (b/w photo) / Bridgeman Images

SZT2992207: Robert Freiherr Lucius von Ballhausen (b/w photo) / Bridgeman Images

SZT2992220: Visitor in the Strandbad Wansee, 1940 (b/w photo) / Bridgeman Images

SZT2992232: Fun water ride, 1896 (b/w photo) / Bridgeman Images

SZT2992241: Erich Ludendorff and Max Hoffmann, 1917 (b/w photo) / Bridgeman Images

SZT2992259: Arthur Henderson in Paris (b/w photo) / Bridgeman Images

SZT2992269: Feierabend by Arthur Kampf (b/w photo) / Bridgeman Images

SZT2992332: Theodore Roosevelt's 'Rough Riders', 1898 (b/w photo) / Bridgeman Images

SZT2992335: Charles Dawes, 1927 (b/w photo) / Bridgeman Images

SZT2992338: Charles Dawes, 1927 (b/w photo) / Bridgeman Images

SZT2992362: Erich Ludendorff, 1927 (b/w photo) / Bridgeman Images

SZT2992365: Erich Ludendorff, 1935 (b/w photo) / Bridgeman Images

SZT2992392: Cordell Hull and Frederico Laredo Bru on the Pan-American Conference in Havana, 1940 (b/w photo) / Bridgeman Images

SZT2992401: Cordell Hull with Wendell L. Willkie, 1941 (b/w photo) / Bridgeman Images

SZT2992428: Alexanderplatz in Berlin, 1927 (b/w photo) / Bridgeman Images

SZT2992509: Stanley M. Bruce and Frank B. Kellogg in front of the U.S. State Department, 1926 (b/w photo) / Bridgeman Images

SZT2992515: J. Butler Wright, Crown Prince Gustav Adolf and Frank B. Kellogg in Washington, 1926 (b/w photo) / Bridgeman Images

SZT2992527: American mail plane 'Lockheed Orion', 1933 (b/w photo) / Bridgeman Images

SZT2992551: Mailboxes with stamp machine, 1928 (b/w photo) / Bridgeman Images

SZT2992554: Mailmen in Berlin, 1897 (b/w photo) / Bridgeman Images

SZT2992557: British postwoman, 1937 (b/w photo) / Bridgeman Images

SZT2992575: Image telegraphs station, 1930 (b/w photo) / Bridgeman Images

SZT2992578: Image telegraphs station, 1930 (b/w photo) / Bridgeman Images