Basilique Notre-Dame is not just a house of prayer, but a worthwhile attraction as well. Make the pilgrimage and enjoy a moment of contemplation.
You'll be spoiled for sightseeing choice when visiting Boulogne-sur-Mer. Basilique Notre-Dame is a good place to begin here, but there are plenty of other worthy spots to appreciate. Nausicaá National Sea Center, Plage De Boulogne Sur Mer, and Château d'Hardelot are not far from the house of prayer and will round out your day nicely.