Along the banks of the Seine, ‘𝗟𝗲𝘀 𝗕𝗼𝘂𝗾𝘂𝗶𝗻𝗶𝘀𝘁𝗲𝘀’ have been a Parisian tradition for centuries, selling rare books, vintage postcards, posters, and charming souvenirs from their famous green boxes.