Isolated in heath and dunes, not far away from the village Saint-Jean-Trolimon, the visitor finds the Chapelle Notre-Dame de Tronoën. Next to the chapel is the calvary, one of the landmarks of Brittany.

Erected 1450/1470, this is the oldest of the great calvaries in Brittany. The rectangular base measures 4,5m x 3,5m. Under the crucifiction (Jesus and the two thieves) are two friezes, depicting themes from the New Testament.