On the Opal Coast, near the magnificent Cap Gris-Nez, Boulogne-sur-Mer is the first fresh fishing port in Europe. A former Roman city with a rich historical heritage, it was awarded the label of "City of Art and History" in 1986. The Upper Town, with its ramparts, its feudal castle and the old part of its belfry built on the site of the Roman Castrum bear witness to the great medieval times of the city. It is also the city that Napoleon chose as the base for his never-ending invasion of England, located only 40 km across the English Channel. Thanks to its location and the nearby seaside resorts, it is home to the national centre of the Nausicaá Sea, considered the largest aquarium in Europe, this exceptional conservation site for marine biodiversity will reveal its riches to you during a unique privatisation.