Église Notre-Dame-de-l'Assomption de Marciac
Church located in Gers, in France.
Each edition grades its towns against each other only.

Museums or galleries make up 5 of the 9 places on the list. Tourdun itself has none of them. A day out reaches Cathédrale Sainte-Marie d'Auch, 36 km away.
Then come 3 galleries, an attraction and a museum, behind Église Notre-Dame-de-l'Assomption de Marciac.
Best 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.
Beyond the town, the 9 nearby are mostly to the south.
The first 20 on the list, numbered as below. The shape is the commune of Tourdun; the orange dot is its centre. © OpenStreetMap contributors · commune boundary: IGN
The two biggest groups: museums or galleries (5) and châteaux or heritage sites (2).
Dark: in Tourdun. Light: in the communes within 5 km of its centre.
All 9 on the list lie within 5 km of its centre.
Nothing is mapped in Tourdun itself; these are within 5 km of its centre.
First of the 12 big names within reach is Cathédrale Sainte-Marie d'Auch, 36 km away.
AttractionCathédrale Sainte-Marie d'Auch36 km east, in AuchAttractionAttractionCircuit Paul-Armagnac29 km northwest, in Caupenne-d'ArmagnacChâteauChâteauChâteau de Montaner26 km southwest, in MontanerCathedralCathedralCathédrale Saint-Jean-Baptiste d'Aire38 km northwest, in Aire-sur-l'AdourCathedralCathedralCathédrale Notre-Dame-de-la-Sède de Tarbes35 km south, in TarbesAttractionAttractionCathédrale Saint-Luperc d'Eauze35 km north, in EauzeMuseumMuseumMusée des Amériques - Auch36 km east, in AuchChâteauChâteauChâteau de Herrebouc28 km northeast, in Saint-Jean-PoutgeAttractionAttractionTour de Termes-d'Armagnac19 km northwest, in Termes-d'Armagnac
GardenJardin Massey35 km south, in TarbesAttractionAttractionSite paléontologique de Sansan38 km east, in SansanChâteauChâteauChâteau de Mérens38 km northeast, in MérensPlaces within 40 km of Tourdun with an article in both French and English Wikipedia, nearest first.
Nothing is mapped in Tourdun itself, but within 5 km there are Église Notre-Dame-de-l'Assomption de Marciac, Arènes de Marciac, Atelier Remi Trotereau and Le Marco.
5 museums and galleries in town or within 5 km, including Atelier Remi Trotereau, Le Marco, Maison Guichard and Musée les Territoires du Jazz.
The nearest with articles in both French and English Wikipedia: Cathédrale Sainte-Marie d'Auch (36 km), Circuit Paul-Armagnac (29 km), Château de Montaner (26 km), Cathédrale Saint-Jean-Baptiste d'Aire (38 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 Tourdun, 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.