Cathédrale Saint-Pierre-et-Saint-Paul de Nantes. Nantes Cathedral, or the Cathedral of St. Peter and St. Paul of Nantes, is a Roman Catholic Gothic cathedral located in Nantes, Pays de la Loire, France. Construction began in 1434, on the site of a Romanesque cathedral, and took 457 years to finish in 1891. I needed this model but did not want to pay for it so I made one. Now it is available to the public for free!