Musée des Arts et de l'Archéologie de Valenciennes
Museum in Valenciennes, France.
Each edition grades its towns against each other only.

Most of what there is to see is châteaux or heritage sites: 7 of 12. None of them is inside Marly itself. Estourmel, 27 km away, is the best-known day out.
Once you have seen Musée des Arts et de l'Archéologie de Valenciennes, try 2 abbeys, 2 forts and a château.
MuseumMusée des Arts et de l'Archéologie de Valenciennes1.7 km northwest, in ValenciennesAbbeyAbbeyAbbaye de Fontenelle4.5 km southwest, in MaingChâteauChâteauChâteau Dampierre3.5 km northwest, in AnzinFortFortTour de la Dodenne1.6 km northwest, in ValenciennesAbbeyAbbeyAbbaye Saint-Jean-Baptiste de Valenciennes2.2 km northwest, in ValenciennesFortFortCitadelle de Valenciennes2.5 km northwest, in ValenciennesBest 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.
Close by, the 12 mostly lie to the northwest.
The first 20 on the list, numbered as below. The shape is the commune of Marly; the orange dot is its centre. © OpenStreetMap contributors · commune boundary: IGN
Châteaux or heritage sites are the biggest group (7), then museums or galleries (4).
Dark: in Marly. Light: in the communes within 5 km of its centre.
All 12 on the list lie within 5 km of its centre.
Museum in Valenciennes, France.
Abbey located in Nord, in France.
Convent located in Nord, in France.
Nothing is mapped in Marly itself; these are within 5 km of its centre.
Estourmel, at 27 km, heads the 12.
MuseumMusée de Cambrai29 km southwest, in CambraiPlaces within 40 km of Marly with an article in both French and English Wikipedia, nearest first.
Nothing is mapped in Marly itself, but within 5 km there are Musée des Arts et de l'Archéologie de Valenciennes, Abbaye de Fontenelle, Château Dampierre and Tour de la Dodenne.
4 museums and galleries in town or within 5 km, including Musée des Arts et de l'Archéologie de Valenciennes, Musée Théophile-Jouglet, L'Espace des Créateurs and L'H de Siège.
The nearest with articles in both French and English Wikipedia: Estourmel (27 km), Cathédrale Notre-Dame-de-Grâce de Cambrai (29 km), Abbaye de Saint-Amand (14 km), Abbaye de Crespin (12 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 Marly, 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.