Arras' two ancient market squares, the Grand' Place and the almost-adjacent, smaller place des Héros (also known as the Petite Place), are surrounded by 17th- and 18th-century Flemish Baroque houses topped by curvaceous gables. Although the structures vary in decorative detail, their 345 sandstone columns form a common arcade unique in France. Like 80% of Arras, both squares – especially handsome at night – were heavily damaged during WWI, so many of the gorgeous façades were reconstructed after the war.