Cathédrale Saint-Apollinaire de Valence
Cathedral located in Drôme, in France.
Each edition grades its towns against each other only.

Most of what there is to see is châteaux or heritage sites: 10 of 18. None of them is inside Cornas itself. A longer outing takes you to Château de Tournon, 12 km off.
Cathédrale Saint-Apollinaire de Valence aside, the next best known are 2 attractions, 2 museums and a château.
ChâteauChâteau de Crussol2.6 km south, in Saint-Péray
AttractionKiosque Peynet4.8 km southeast, in Valence
MuseumMusée d'Art et d'Archéologie de Valence4.6 km southeast, in ValenceAttractionAttractionMaison des Têtes de Valence4.7 km southeast, in Valence
MuseumCentre du patrimoine arménien de Valence4.9 km southeast, in ValenceBest known first: by how many Wikipedia and sister-site articles cover each place (Wikidata’s count). It isn’t a ranking of how good they are.
To the southeast is where most of the 18 nearby are.
The first 20 on the list, numbered as below. The shape is the commune of Cornas; the orange dot is its centre. © OpenStreetMap contributors · commune boundary: IGN
There are more châteaux or heritage sites (10) than anything else, then museums or galleries (5).
Dark: in Cornas. Light: in the communes within 5 km of its centre.
18 places, all within 5 km of its centre, make the list.
Cathedral located in Drôme, in France.
Museum in Valence, France.
Abbey located in Drôme, in France.
Nothing is mapped in Cornas itself; these are within 5 km of its centre.
Allow a day for Château de Tournon, 12 km away, the pick of 12.
MuseumChâteau de Tournon12 km north, in Tournon-sur-RhôneAttractionAttractionPalais idéal36 km northeast, in HauterivesAbbeyAbbeyAbbaye Notre-Dame de Triors25 km northeast, in TriorsChâteauChâteauChâteau de La Tourette18 km southwest, in Vernoux-en-Vivarais
ChâteauTour de Crest29 km southeast, in CrestZooZooSafari de Peaugres36 km north, in PeaugresChâteauChâteauTour de Ratières27 km north, in RatièresChâteauChâteauChâteau d'Albon32 km north, in AlbonChâteauChâteauChâteau de l'Arthaudière35 km northeast, in Saint-Bonnet-de-ChavagneAbbeyAbbeyAbbaye de Saint-Antoine-l'Abbaye37 km northeast, in Saint Antoine l'AbbayeChâteauChâteauChâteau de Soubeyran17 km west, in Saint-Barthélemy-GrozonChâteauChâteauChâteau de Grane26 km south, in GranePlaces within 40 km of Cornas with an article in both French and English Wikipedia, nearest first.
Nothing is mapped in Cornas itself, but within 5 km there are Cathédrale Saint-Apollinaire de Valence, Château de Crussol, Kiosque Peynet and Musée d'Art et d'Archéologie de Valence.
5 museums and galleries in town or within 5 km, including Musée d'Art et d'Archéologie de Valence, Centre du patrimoine arménien de Valence, Musée de Crussol and Atelier Ricardo Ponce.
The nearest with articles in both French and English Wikipedia: Château de Tournon (12 km), Palais idéal (36 km), Abbaye Notre-Dame de Triors (25 km), Château de La Tourette (18 km).
From OpenStreetMap and Wikidata: named museums, galleries, châteaux, abbeys, gardens, zoos, theme parks and other visitor attractions whose mapped point lies inside the commune of Cornas, then those in the communes within 5 km of its centre, and well-known places within 40 km. Houses, ruins and gardens need a sign they’re open to visitors; places marked private, closed or disused are left out. The historic-monument link is the Culture ministry’s Mérimée record. A place that isn’t mapped isn’t listed, so this isn’t everything there is to see.
Sources: OpenStreetMap (© OpenStreetMap contributors, ODbL), Wikidata (CC0: descriptions, websites, Wikipedia articles), the Culture ministry’s Mérimée database (Licence Ouverte 2.0), IGN commune boundaries. Distances are from the commune’s centre point.
Photos from Wikimedia Commons, each under its own licence (our copy, resized).
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.