Swooping warplanes, axe-carrying warriors, a drone light show over the Eiffel Tower and fireworks in nearly every French town… France is celebrating its national holiday Monday with 7,000 people marching, on horseback or riding armored vehicles along the cobblestones of the Champs-Elysees, the most iconic avenue in Paris. But what exactly are the origins of Bastille Day? Answer by FRANCE 24 international affairs editor, Philip Turle.