The Gothic church of Saint-Éloi, dedicated to the patron saint of Flemish metalworkers, dominates the central square alongside its separate belfry tower. The church dates from the 15th and 16th centuries and was repeatedly damaged and restored through centuries of war. The interior contains good carved woodwork and a number of notable artworks that survived the various conflicts.
The belfry alongside is the more remarkable structure: a detached Flemish carillon tower from the 16th century, listed as a UNESCO World Heritage Site as part of the Belfries of Belgium and France designation. The carillon of 50 bells is still played for major civic occasions. The tower can be climbed for a view over the town and port — the industrial scale of the harbour installations, the pale North Sea beaches, and the Belgian coast are all visible on a clear day.