Return of the Mona Lisa at the end of World War Two. --- On the eve of war, curators at the Louvre swathed the museum's most priceless painting in layers of waterproof paper, boxed it up and spirited it to the French countryside for safekeeping. The painting was moved another five times during the war before she was safely returned to the Louvre after the Liberation.
September 3rd, 1967, Stockholm, Sweden: The day Sweden changed from driving on the left to driving on the right
German Graf Zeppelin ~ The Hindenburg departed from Frankfurt on the evening of May 3, 1937 on the first of its ten round trips between Europe and the United States scheduled for its second year of commercial service.
NYC. The Cotton Club was a famous night club in New York City that operated during Prohibition. While the club featured many of the greatest African American entertainers of the era, such as Duke Ellington, Count Basie, Bessie Smith, Cab Calloway, The Nicholas Brothers, Ella Fitzgerald, Louis Armstrong, Nat King Cole, Billie Holiday, and Ethel Waters, it generally denied admission to blacks. During its heyday, it served as a chic meeting spot in the heart of Harlem.