practices in Brittany. However, successive polls show that the region tends to be more and more nonreligious. Catholic religion has started to decline after the Second World War, during the urbanisation of Brittany. A poll conducted in 2006 showed that Morbihan was the only département to have a strong Catholic population, around 70% of its inhabitants belonging to that religion. Loire-Atlantique and Côtes-d'Armor were among the least Catholic French départements, with only 50% of Catholics, while Ille-et-Vilaine and Finistère were at around 65%. Other religions are almost non-existent, apart from Islam which gathers between 1 and 3% of the inhabitants in Ille-et-Vilaine and Loire-Atlantique. Culture Architecture Brittany is home to many megalithic monuments; the words menhir and dolmen come from the Breton language. The largest menhir alignments are the Carnac stones. Other major sites include the Barnenez cairn, the Locmariaquer megaliths, the Menhir de Champ-Dolent, the Mane Braz tumulus and the Gavrinis tomb. Monuments from the Roman period are rare, but include a large temple in Corseul and scarce ruins of villas and city walls in Rennes and Nantes. Brittany has a large number of medieval buildings. They include numerous Romanesque and French Gothic churches, usually built in local sandstone and granite, castles and half-timbered houses visible in villages, towns and cities. Several Breton towns still have their medieval walls, such as Guérande, Concarneau, Saint-Malo, Vannes, Fougères and Dinan. Major churches include Saint-Pol-de-Léon Cathedral, Tréguier Cathedral, Dol Cathedral, Nantes Cathedral and the Kreisker chapel. Most of the Breton castles were rebuilt between the 13th and the 15th century, such as the Château de Suscinio, the Château de Dinan, the Château de Combourg, the Château de Largoët, the Château de Tonquédec, the Josselin Castle and the Château de Trécesson. The most impressive castles can be seen along the border with France, where stand the Château de Fougères, the Château de Vitré, the Château de Châteaubriant and the Château de Clisson. The French Renaissance occurred when Brittany lost its independence. The Renaissance architecture is almost absent in the region, except in Upper Brittany, close to the border with France. Major sites include the Château des ducs de Bretagne, the last permanent residence of the dukes, which displays the transition from late Gothic to Renaissance style. The Château de Châteaubriant, a former fortress, was transformed into a vast palace in the Italian style. In Lower Brittany, the medieval style never totally disappeared. However,