Abbaye royale de Saint-Riquier
Abbey located in Somme, in France.
Each edition grades its towns against each other only.

Most of what there is to see is châteaux or heritage sites: 3 of 5. Oneux itself has none of them. If you have a day, head to Cathédrale Notre-Dame d'Amiens, 36 km away.
Abbaye royale de Saint-Riquier aside, the next best known are an attraction, a fort and a château.
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.
To the southwest is where most of the 5 lie.
The first 20 on the list, numbered as below. The shape is the commune of Oneux; the orange dot is its centre. © OpenStreetMap contributors · commune boundary: IGN
The biggest group is châteaux or heritage sites, with 3 of the 5.
Dark: in Oneux. Light: in the communes within 5 km of its centre.
Nothing is inside Oneux itself; these 5 are within 5 km of its centre.
Nothing is mapped in Oneux itself; these are within 5 km of its centre.
Worth the drive, Cathédrale Notre-Dame d'Amiens (36 km) is first of the 12.
AttractionCathédrale Notre-Dame d'Amiens36 km southeast, in Amiens
MuseumMusée de Picardie36 km southeast, in AmiensChâteauChâteauChâteau de Rambures29 km southwest, in RamburesTheme parkTheme parkParc Samara26 km southeast, in La Chaussée-TirancourtAttractionAttractionTour Perret37 km southeast, in AmiensMuseumMuseumChemin de fer de la baie de Somme24 km west, in Saint-Valery-sur-SommeChâteauChâteauChâteau de Bertangles30 km southeast, in BertanglesGardenGardenJardins de Valloires25 km northwest, in ArgoulesMonastery or conventMonastery or conventChartreuse Notre-Dame-des-Prés de Neuville-sous-Montreuil38 km north, in Neuville-sous-Montreuil
GardenJardin Jungle Karlostachys40 km west, in EuChâteauChâteauCitadelle de Montreuil-sur-Mer39 km northwest, in Montreuil-sur-Mer
MuseumMusée de l'Hôtel de Berny37 km southeast, in AmiensPlaces within 40 km of Oneux with an article in both French and English Wikipedia, nearest first.
Nothing is mapped in Oneux itself, but within 5 km there are Abbaye royale de Saint-Riquier, Beffroi de Saint-Riquier, Tour Margot and Château de Saint-Riquier.
One, in town or within 5 km: Musée départemental de la vie rurale.
The nearest with articles in both French and English Wikipedia: Cathédrale Notre-Dame d'Amiens (36 km), Musée de Picardie (36 km), Château de Rambures (29 km), Parc Samara (26 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 Oneux, 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.