Immaculée-Conception de Saint-Omer Church

The church of Saint-Denis is recognisable by its enormous 13th-century bell tower, the oldest in the North of France. The church was favoured by the Collège de Saint-Omer which was run by English Jesuits. Many English and American Catholic families sent their children there to study, despite Queen Elizabeth I's prohibition. The interiors are particularly rich in examples of numerous artistic movements from the 15th to the 19th century. Its classical barrel-vaulted sanctuary, interiors and furnishings date from an 18th-century reconstruction.

Built between 1615 and 1640 on the plans of Jean Du Blocq (1583-1656), then in 1747, the first church having become too small.

Notre-Dame-de-Saint-Omer Cathedral, in Saint-Omer, was built in the 11th century and it became an important artistic and interlectual center. From the 13th century onwards I twas transformed and became an exceptional gothic building, one of the most sumptuous witnesses to gothic art, in the Northern Provinces.