This fine Gothic building (13C-16C) is preceded by an impressive unfinished towered façade listed by UNESCO. The nave rests on cylindrical columns with crocket capitals. The elegant triforium is ringed by a gallery. Of particular interest is the 16C Antwerp wooden altarpiece relating the Life of the Virgin Mary. The treasury boasts some superb objects and the cloister is adorned with interesting capitals. A museum exhibits artefacts found on the site which has a history dating back two thousand years.