Château de Breteuil
French chateau owned by Louis Auguste Le Tonnelier de Breteuil.
Each edition grades its towns against each other only.

Boullay-les-Troux and its surroundings hold 11 attractions, 6 châteaux and 3 museums. With nothing in Boullay-les-Troux, the list has 21 places within 5 km of its centre. Tour Eiffel is worth a day, 27 km from the centre.
Next to Château de Breteuil, the best known are 2 châteaux, 2 museums and an attraction.
MuseumFondation de Coubertin2.7 km north, in Saint-Rémy-lès-Chevreuse
ChâteauChâteau de Vaugien3.6 km northeast, in Saint-Rémy-lès-Chevreuse
MuseumMusée Raymond-Devos3.5 km northeast, in Saint-Rémy-lès-ChevreuseBest 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.
The 21 outside town cluster to the west.
The first 20 on the list, numbered as below. The shape is the commune of Boullay-les-Troux; the orange dot is its centre. © OpenStreetMap contributors · commune boundary: IGN
Most are other sights, 11 in all, ahead of châteaux or heritage sites (7).
Dark: in Boullay-les-Troux. Light: in the communes within 5 km of its centre.
Each of the 21 is within 5 km of its centre.
French chateau owned by Louis Auguste Le Tonnelier de Breteuil.
Castle located in the town of Chevreuse, France, in the département of Yvelines.
Monastery located in Essonne, in France.
Nothing is mapped in Boullay-les-Troux itself; these are within 5 km of its centre.
The history of Boullay-les-Troux → · Parks and trails in Boullay-les-Troux →
Start with Tour Eiffel, 27 km off, the best known of 12.
AttractionTour Eiffel27 km northeast, in Paris 7e
AttractionChâteau de Versailles15 km north, in VersaillesMuseumMuseumMusée du Louvre29 km northeast, in Paris 1er
AttractionCathédrale Notre-Dame de Paris29 km northeast, in Paris 4e
MuseumMusée d'Orsay28 km northeast, in Paris 7e
AttractionAvenue des Champs-Élysées28 km northeast, in Paris 8e
AttractionArc de triomphe de l'Étoile28 km northeast, in Paris 8eAttractionAttractionPendule de Foucault28 km northeast, in Paris 5e
AttractionPalais de l'Élysée29 km northeast, in Paris 8e
AttractionCimetière du Père-Lachaise32 km northeast, in Paris 20e
MuseumHerbier29 km northeast, in Paris 5e
AttractionPlace de la Concorde29 km northeast, in Paris 8ePlaces within 40 km of Boullay-les-Troux with an article in both French and English Wikipedia, nearest first.
Nothing is mapped in Boullay-les-Troux itself, but within 5 km there are Château de Breteuil, Château de la Madeleine, Château de Méridon and Fondation de Coubertin.
3 museums and galleries in town or within 5 km, including Fondation de Coubertin, Musée Raymond-Devos and Musée Grataloup.
The nearest with articles in both French and English Wikipedia: Tour Eiffel (27 km), Château de Versailles (15 km), Musée du Louvre (29 km), Cathédrale Notre-Dame de Paris (29 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 Boullay-les-Troux, 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.