The imposing ruins of Aulne Abbey stand at the bottom of the valley of the Sambre. The abbey was founded by St Landelin in the 7C and became home to a community of Cistercians in 1147. The 16C Gothic church with a Classical façade (1728) has retained its magnificent chancel and transept. As you take the path on the right that led to the monks' quarters and infirmary, you get a fine overview of the apse and transept.