Le Bon Marché, Paris

Le Bon Marché is the world's first modern department store, founded in 1838 on Paris's Left Bank and transformed into a retail pioneer by Aristide and Marguerite Boucicaut starting in 1852. The couple introduced concepts now standard everywhere: fixed prices, free browsing, product returns, seasonal sales, and mail-order catalogues. The building itself features iron-and-glass architecture engineered by Gustave Eiffel's studio in 1879, with soaring skylights and grand staircases visible throughout.