Devastated during the Revolution and destroyed only in 1858, the foundation stone of the present chapel was laid on March 19, 1859. Completed in 1861, the building was consecrated on July 22, 1862.
Of contemporary architecture, the curved lines given to the courtyard of the sailors' chapel evoke, with its porthole-like openings, the silhouette of a ship.
The foundation stone was laid on December 18, 1960. The work, which began on January 4, 1961, was carried out by the masonry company Duclos-Goncalvez et cie, a carpentry company from Boulogne, by the carpentry company François Condette. On December 17, 1961, the church received the blessing of the bishop.
The present basilica, under the name of Notre-Dame, was built in the 19th century on the ruins of a medieval building. The building rests on one of the largest crypts in France (100 metres long and with a surface area of 1,400m²), which was laid out during the construction work on the foundations of the Romanesque crypt.
The foundation stone was laid on August 29, 1857. The work was carried out by the contractor Adolphe Crouy and the carpenter-joiner A. Lacour. The church was blessed on December 15, 1859, consecrated on July 4, 1868 and given to the city on May 25, 1868. After the damages of the Second World War, it was restored from 1951 to 1959 according to the plans of the architect Yves Laloy, by the masonry firm Jean Lapouille d'Hazebrouck. The sculpted capitals are of Donlinger marble-sculptor.
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