Every 11 November, France commemorates the end of the World War I. It's called "l'Armistice". The armistice was signed on 11 novembre 1918 in France. It ended a war that lasted four years and killed millions of people. This public holiday is to pay tribute to the soldiers who died for France on the battlefield. It has been a public holiday since 1922.
In 1920, an unknown soldier who died during World War I in Verdun was buried under the Arc de Triomphe at the end of the Champs-Élysées in order to pay tribute to the unidentified dead soldiers. Every year, flowers are put on the tombstone of the unknown soldier ("La tombe du Soldat inconnu") and a ceremony is held there.
