The Église Notre-Dame is the oldest surviving significant building in Calais, a Gothic and Renaissance church whose construction spanned from the 13th to the 17th century. Its exterior has the sturdy, rather austere quality common to northern French ecclesiastical architecture, but the interior is worth stepping inside for the quality of the light filtering through the nave and the sense of accumulated history in the stonework.
The church was damaged during World War Two bombing — much of Calais was — but was carefully restored. Look for the English-influenced Perpendicular Gothic elements in the choir, a legacy of the city's two centuries under English rule. The church sits near the central market square, making it an easy stop on any walk through the old town.