Boulogne-sur-Mer, with its rich maritime heritage, stands as a testament to the enduring relationship between humans and the sea. The city's bustling port speaks to its historical significance as a center for fishing and trade. Within the ancient walls of the old town, the Notre-Dame Basilica's crypt offers a glimpse into the artistic legacy of the region, while the belfry, once a Norman castle's keep, continues to watch over the city as a symbol of its storied past.