The Grande Braderie de Lille, located in Lille, France, is the biggest flea market in Europe and a highlight of the year for antique enthusiasts. Drawing in more than two million visitors, this lively outdoor festival turns the whole city into a vibrant marketplace and cultural celebration during the first weekend of September. With around 10,000 stalls, the streets are brimming with antiques, collectibles, and unique finds. The event runs from Saturday morning through Sunday evening, providing over 30 hours of uninterrupted exploration in a completely pedestrian-friendly environment.