The town of Poissy, situated along the Seine River, invites walkers to explore a range of historical and artistic landmarks. One of these is the home of André Derain, a prominent figure in the fauvist movement, located in the nearby village of Chambourcy. In Poissy itself, the Collegiate Church of Notre-Dame has a long and eventful history, having been damaged during the Hundred Years' War and later during religious conflicts. It was restored in the 19th century and now displays a collection of statues from the 14th and 16th centuries, including a richly detailed Saint John the Baptist and Saint Barbara, who is depicted beside a small model of the tower where she was imprisoned. Another statue shows the Virgin Mary taking her first steps with her mother. The town hall, opened in 1937, features a bas-relief by Ossip Zadkine that commemorates the victory of the Popular Front, showing the muses of music and tragedy around a worker. Inside, a 12-meter mural illustrates street performers entertaining peasants. The path continues through the central prison and toward the district of the former convent, which was established by Philip the Fair to honor the canonization of Louis IX, later known as Saint Louis. The abbey’s street, with its rough paving, creates a sense of stepping back in time, especially with the view of the large roof of a medieval barn. Nearby, the Poissy colloquium of 1561 took place, an effort to bridge the divide between Catholics and Protestants. On the other side of a wall, a neo-Gothic house with elegant windows and a balustrade stands out next to a large glasshouse that once served as the workshop of Ernest Meissonier, a 19th-century academic painter known for his painting of a sullen Napoleon. The path continues through the forest of Saint-Germain-en-Laye, crosses the A14 motorway to reach Chambourcy, and climbs to the former summer residence of Claude Bigot de Sainte-Croix, a short-lived foreign minister of Louis XVI. This home later became the secondary residence of André Derain until his death in 1954. In Chambourcy, the Church of Sainte-Clotilde features a neoclassical entrance and wooden vaults that extend to a striking cul-de-four at the end of the apse. The walk continues to a cemetery with a pyramid-shaped tomb, the function of an open lucarnette on one side still unknown. The path crosses a stream and family gardens to reach the edge of the Marly-le-Roi forest, a 2,000-hectare area where oaks grow alongside cherries, chestnuts, and other trees, an unusual mix of species. The Saint-Nom-la-Bretèche station is reached after about an hour of walking uphill, though the center of this small town, famous for its golf course, lies on the other side of the Normandy motorway and is not accessible from this route. The GR of the Green Belt of Île-de-France provides a detailed description of the hike, starting from Poissy station (78), line J and RER A, and ending at Saint-Nom-la-Bretèche–Marly Forest station. The hike is 12.5 kilometers and takes about three and a half hours. Near the route, the Villa Savoye, a modernist architectural masterpiece by Le Corbusier, is accessible off the main path. It is open from 10 am to 5 pm, except on Mondays, with an entrance fee of 9 €, free on the first Sunday of each month, and the surrounding park is free to visit. The André Derain House in Chambourcy offers guided tours and lectures on October 17 and 18 at 3 pm, lasting 1 hour and 30 minutes, with a cost of 5-10 €. The Desert of Retz, an 18th-century landscape garden, is open until the end of October on Saturdays and Sundays from 2 pm to 6 pm, with last entries at 4:30 pm and an entrance fee of 5-10 €. The Indian-Pakistani restaurant La Cardamome in Chambourcy is open daily at noon and in the evening, except Mondays, with a menu starting from 15 €.