Cluny Abbey
The crossing dome on squinches at the abbey church of Tournus may date to the 11th century. The Basilica of Saint-Martin d'Ainay has similar features. The largest church in France was Cluny Abbey, but it has been destroyed. The surviving transept arm of Cluny Abbey, built in the early 12th century, has an octagonal dome on trumpet squinches beneath an octagonal tower and spire and flanked on either side by barrel vaults. Autun Cathedral has a similar nave arrangement to that of Cluny Abbey.