Châteaux de Château-Verdun et de Gudanes
18th-century château in Ariège, France.
Each edition grades its towns against each other only.

None of our places to visit is in Lassur; 3 are within 5 km of its centre. On the list: 2 châteaux and a museum, among others. Drive 14 km to reach Château de Montségur.
The list goes on from Châteaux de Château-Verdun et de Gudanes to a château and a museum.
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.
Châteaux de Château-Verdun et de Gudanes marks the outer edge, 4.9 km away.
The first 20 on the list, numbered as below. The shape is the commune of Lassur; the orange dot is its centre. © OpenStreetMap contributors · commune boundary: IGN
Most common are châteaux or heritage sites: 2 of 3.
Dark: in Lassur. Light: in the communes within 5 km of its centre.
Here are the 3 places within 5 km of its centre.
Nothing is mapped in Lassur itself; these are within 5 km of its centre.
Most famous of the 12 is Château de Montségur, 14 km from the centre.
MuseumChâteau de Foix24 km northwest, in FoixAttractionAttractionGrotte de Lombrives12 km northwest, in UssatChâteauChâteauChâteau de Miglos12 km west, in MiglosChâteauChâteauChâteau de Roquefixade19 km north, in RoquefixadeAttractionAttractionChâteau de Puivert31 km northeast, in PuivertChâteauChâteauChâteau de Montaillou13 km east, in MontaillouAttractionAttractionFour solaire d'Odeillo39 km southeast, in Font-Romeu-Odeillo-ViaCathedralCathedralCathédrale Saint-Antonin de Pamiers40 km north, in Pamiers
CathedralCathédrale Saint-Maurice de Mirepoix37 km north, in MirepoixChâteauChâteauChâteau d'Usson29 km east, in RouzePlaces within 40 km of Lassur with an article in both French and English Wikipedia, nearest first.
Nothing is mapped in Lassur itself, but within 5 km there are Châteaux de Château-Verdun et de Gudanes, Château de Lordat and Espace muséographique de Talcaneô.
One, in town or within 5 km: Espace muséographique de Talcaneô.
The nearest with articles in both French and English Wikipedia: Château de Montségur (14 km), Grotte de Niaux (13 km), Château de Foix (24 km), Grotte de Lombrives (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 Lassur, 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.