The first Tour de France comes to an end. Maurice Garin became the first person to win the debut of the now annual bike race.

Paris Metro opens. One of the densest metros in the world and the second largest metro in Europe, the first line of the Paris Metro opened during the World's Fair.

Franco-Prussian War starts. The war involving France, under Napoleon and the Kingdom of Prussia began with French declaration of war. The war lasted for 9 months and ended with a German victory.

Seneca Falls Convention begins. One of the first women's rights convention to be held in American history, the two-day convention attracted 300 women and men who protested the social, economic, and political discrimination American women faced.

Mary I replaces Lady Jane Grey as Queen of England. Also known as Bloody Mary due to her brutal persecution of Protestants, Mary I was the only child of Catherine of Aragon and Henry III.