The Cathédrale Saint-Corentin is the centrepiece of Quimper's old town and one of the finest Gothic cathedrals in Brittany. Building began in the 13th century, but the two distinctive spires — the feature that defines the city's skyline — weren't completed until the 1850s. The statues mounted high between the towers represent King Gradlon, the mythical founder of Quimper, surveying his city from horseback.
Inside, the cathedral is full of light and medieval character. The stained glass windows from the 15th and 16th centuries are among the best in Brittany, and the nave has a notable kink — it bends slightly to the left as you walk from the entrance toward the altar, making the building unique in the region. Free to enter, though donations are appreciated.