Mont Valérien
From the Mont Valérien, Suresse, the French physicist Fizeau projected a lightbeam towards a mirror at Montmartre. Interposed in the path was a rapidly spinning cogweel with 720 precisely machined teeth. The beam would be exclipsed if the spin of the wheel was going faster. From this, Fiezau could calculate the speed of light as 315 400 km/sec. This was 1849!
Author: Dromos
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Hill

Château de Beynes
The Château de Beynes is a ruined castle in the commune of Beynes in the Yvelines département of France.
The first castle, a motte-and-bailey, was built in the bottom of the valley of the Mauldre River, at a time when castles were usually built on high ground. It had a defensive role at that time, with the river as a western defence line of the French Royal domain, defending against Normandy and other possible combatants. It was owned by the English during the Hundred Years' War.
Author: Wikipedia
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Castle

Villepreux
Villepreux ) is a commune in the Yvelines department in the Île-de-France in north-central France located about 12 km west of Versailles, in the plaine de Versailles, almost in line with the perspective of the Grand Canal . The municipality, in low relief, is marked in the northern part of the depression of the valley ru Gally, and its tributaries, the ru de l'Oisemont and the ru de l'Arcy. The municipality is still largely rural. Urbanization is about 15% of the area, developed in the southern part, in the vicinity of Clayes-sous-Bois in the area served by railway services from Paris and Versailles.
Author: Wikipedia
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Municipality

Arboretum de Grignon
The Arboretum de Grignon is an arboretum located within the campus of the Institut des sciences et industries du vivant et de l'environnement on Avenue Lucien Brétignières, Thiverval-Grignon, Yvelines, Île-de-France, France. It is closed to the public but may be visited by groups.
The arboretum was established in 1873 by Pierre Mouillefert, professor at Grignon, who published in 1896 a pamphlet describing the arboretum at that date; however, it was lost in 1940. The arboretum grew gradually over time, with the most recent plantings between 1976-1978. Various of the trees were labeled in 1975 by Mr. George Callen of the Arboretum de Chèvreloup, and in 1991 Mr. Augustin Scalbert created a map identifying almost all trees. At that time, the arboretum contained approximately 230 specimens .
Author: Wikipedia
Arboretum

Chavenay
Chavenay ), also known as Vallon de Chavenay, is a commune in the Yvelines department in the Île-de-France region in north-central France. It is located close to Saint-Nom-la-Bretèche, Saint-Germain-en-Laye, and Versailles.Along with Crespières, Feucherolles and Saint-Nom-la-Bretèche Chavenay is twinned with Rösrath, Germany.
Municipality

Saint-Germain-de-la-Grange
Saint-Germain-de-la-Grange is a commune in the Yvelines department in the Île-de-France in north-central France.
Municipality

Noisy-le-Roi station
Noisy-le-Roi is a railway station in the town Noisy-le-Roi, Yvelines department, northern France. It is on the western part of the Grande Ceinture line.Until 6 July 2019, it was part of Transilien Line L, and became part of Île-de-France tramway Line 13 Express on 6 July 2022.
Trainstation

Forêt de Marly
The Forêt de Marly is a 2000 hectare forest estate in Yvelines, between Saint-Germain-en-Laye and Versailles about 15 km to the west of Paris. It is about 12 km long east to west, over the communes of Louveciennes, Marly-le-Roi, Saint-Nom-la-Bretèche, Feucherolles and others. Historically, it was a hunting estate of the kings of France, then of the presidents of the Republic, but is now divided along its whole length by the A13 autoroute.
Forest

Morainvilliers
Morainvilliers is a commune in the Yvelines department in the Île-de-France region in north-central France.Morainvilliers is one of the French cities with the highest per capita tax income and is characterised by particularly high property prices. Its pleasant living environment and its proximity to Paris make it a residential community much sought-after by the wealthiest households.

National Archaeological Museum
The Musée d'Archéologie nationale is a major French archeology museum, covering pre-historic times to the Merovingian period. It is located in the Château de Saint-Germain-en-Laye in the département of Yvelines, about 19 kilometres west of Paris.The château had been one of the most important French royal residences in the Paris region since the 12th century. Following the move of the court to Versailles, the castle housed the court of James II of England in exile, became a cavalry school in 1809 and finally a military prison from 1836 to 1855. The château, which was in very poor condition, was classified as a monument historique on 8 April 1863.
Museum

Château de Saint-Germain-en-Laye
The Château de Saint-Germain-en-Laye is a former royal palace in the commune of Saint-Germain-en-Laye, in the département of Yvelines, about 19 km west of Paris, France. Today, it houses the musée d'Archéologie nationale .The first castle, named the Grand Châtelet, was built on the site by Louis VI in 1124. The castle was expanded by Louis IX in the 1230s.
Castle

Croissy-sur-Seine
Croissy-sur-Seine is a commune in the Yvelines department in the Île-de-France region in north-central France. It is a suburban town on the western outskirts of Paris. Many expatriates reside in Croissy, given as it is the site of The British School of Paris, one of the top ten private international schools in the world.

Saint-Nom-la-Bretèche–Forêt de Marly station
Saint-Nom-la-Bretèche–Forêt de Marly is a railway station in the French commune of L'Étang-la-Ville in the département of Yvelines. Its name derives from Saint-Nom-la-Bretèche and the Forêt de Marly. It links to the CSO bus line 1.It is one of the termini of the Transilien Paris–Saint-Lazare, made up of one platform between two lines.
Trainstation

Rocquencourt
Rocquencourt ) is a former commune in the Yvelines department in the Île-de-France in north-central France. On 1 January 2019, it was merged into the new commune Le Chesnay-Rocquencourt. It is about 4 kilometres north-west of Versailles and 19 kilometres west of center Paris.The commune is mainly known as the location of a research unit of INRIA as well as a freeway exchange known as the Rocquencourt Triangle , which is often mentioned in traffic news.

Maison Fournaise
The Maison Fournaise is a restaurant and museum located on the Île des Impressionnistes, a long island in Seine river in Chatou, west of Paris.In 1857, Alphonse Fournaise bought land in Chatou to open a boat rental, restaurant, and small hotel for the new tourist trade.
House

Goupillières
Goupillières ) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Hargeville
Hargeville is a commune in the Yvelines department in the Île-de-France region in north-central France.

Goussonville
Goussonville is a commune in the Yvelines department in the Île-de-France region in north-central France.

Jumeauville
Jumeauville is a commune in the Yvelines department in the Île-de-France region in north-central France.

Garches
Garches ) is a commune in the western suburbs of Paris, France. It is located 11.9 km from the centre of Paris.Garches has remained largely residential, but is also the location of Raymond Poincaré University Hospital, which specialises in traumatology, road accidents and physiotherapy.

Suresnes
Suresnes ) is a commune in the western suburbs of Paris, Île-de-France. Located in Hauts-de-Seine, 9.3 km from the centre of Paris, it had a population of 49,145 as of 2016. The nearest communes are Nanterre, Puteaux, Rueil-Malmaison, Saint-Cloud and Boulogne-Billancourt. It is served by two stops on Île-de-France tramway Line 2 and Suresnes–Mont-Valérien station on the Transilien network, both giving access to La Défense and its RER A and Paris Métro Line 1 services. Suresnes's landmarks include the Mémorial de la France combattante and Suresnes American Cemetery and Memorial below Fort Mont-Valérien, as well as Foch Hospital in the town centre.

Château de Madrid
The Château de Madrid was a Renaissance building in France. It was built in Neuilly, on the edge of the Bois de Boulogne, near Paris in the early 16th century. It fell into disuse in the 17th and 18th centuries and was almost completely demolished in the 1790s.The construction of the château was ordered by Francis I of France in 1528, who had been captured at the Battle of Pavia in 1525 and held for some months in Madrid. On his return to France, Francis found the Louvre uncomfortable, and he desired a new palace, construction started in 1529.
Castle

Jardin botanique de l'Institut National
The Jardin botanique de l'Institut National is a small botanical garden located within the campus of the Institut des sciences et industries du vivant et de l'environnement , formerly known as the Institut National Agronomique Paris-Grignon, on the Avenue Lucien Brétignières, Thiverval-Grignon, Yvelines, Île-de-France, France. It is closed to the public but may be visited by groups.
The garden was established sometime before 1979 on a plot of land adjacent to the Arboretum de Grignon. Today it consists of 34 beds containing about 1,000 taxa with an emphasis on Graminae, Leguminosae, ornamental plants, and plants of limestone soils. The Association de l'arbre de fer was established in 2001 to protect and enhance the campus' natural environment, and in 2003 it began restoration and enlargement of the arboretum, as well as creation of a botanical trail and rehabilitation of the garden.
POI

Villa Stein
Villa Stein is a building designed by Le Corbusier between 1926 and 1928 at Garches, France. The building is also known as Villa Garches, Villa de Monzie, and Villa Stein-de Monzie. Located at 17 Rue de professeur Victor Pauchet, the villa was built for Gabrielle Colaco-Osorio de Monzie and Sarah Stein, sister-in-law of American writer Gertrude Stein, between 1926 and 1928.
POI

Golf de Saint-Cloud
Golf de Saint-Cloud is a 36-hole golf complex located in the parishes of Garches, Rueil-Malmaison and Vaucresson, 12 km west of central Paris, France.Opened in 1913 and designed by well renowned English golf course designer Harry Shapland Colt, the Vert or Green course is a championship course commissioned by Saint-Cloud's then owner, an American lawyer named Henry Cachard. The Estate was previously owned by Empress Joséphine, Napoleon's wife.
Golf Course

Avenue Charles-de-Gaulle
Avenue Charles-de-Gaulle is an avenue in Neuilly-sur-Seine, Paris, France, named after Charles de Gaulle.
The avenue forms part of the Route nationale 13. Until 1971, it was called Avenue de Neuilly, a rare case in France where the road bears the name of the commune in which it is found. Avenue Charles-de-Gaulle continues along Paris's axe historique, which stretches from the original Palais des Tuileries to Porte Maillot, and which finishes at Pont de Neuilly. It forms a segment of the axe majeur, which links Paris and La Défense. It is used by a daily flow of 160,000 vehicles.
POI

Communauté d'agglomération Saint Germain Boucles de Seine
The Communauté d'agglomération Saint Germain Boucles de Seine is the communauté d'agglomération, an intercommunal structure, in the western suburbs of Paris. It is located in the Yvelines and Val-d'Oise departments, in the Île-de-France region, northern France. It was created in January 2016. Its seat is in Le Pecq. Its area is 666.7 km2. Its population was 335,109 in 2018.

Pavillon du Butard
The Pavilion du Butard is a hunting lodge in the Forêt de Fausses-Reposes in the territory of La Celle-Saint-Cloud in Yvelines, France. Part of the gardens of Versailles, it was designed by Ange-Jacques Gabriel for Louis XV and built between 1750 and 1754. It was made state property on 27 June 1794 by François-Nicolas Périgon, notary at Paris, during the French Revolution. On 23 April 1802 it became the property of empress Joséphine de Beauharnais, who wished to merge it with her Malmaison estate, but it returned to being state property on her divorce from Napoleon in 1809. It was later also enjoyed by Charles X of France and emperor Napoleon III of France. It was occupied by the Prussians during the Franco-Prussian War. Still state property, it was made a monument historique on 29 August 1927.
Monument

Côte de Beule
RouteYou Climb Code : D_4_d
Length : 3.21 km
Ascent : 145 m
Average grade : 4 m / 100 m - 4.25 %
Maximal grade : 5.84 %
Author: Cols&Climbs@RouteYou
Slope

L'Étang-la-Ville
L'Étang-la-Ville ) is a commune in the Yvelines department in the Île-de-France in north-central France.L'Étang-la-Ville is served by two railway stations on the Transilien Line L: L'Étang-la-Ville and Saint-Nom-la-Bretèche–Forêt de Marly.
Arrondissement