Piazza Mercantile is a historic square in the heart of Bari Vecchia, where locals and tourists alike gather to soak up the lively atmosphere, especially after the sun sets. Surrounded by historic buildings like Palazzo del Sedile (which used to house the town hall) and charming cafes, restaurants, and bars, it's the perfect spot for people-watching, sipping on espresso, and immersing yourself in the authentic local vibe.