Attractions and places to see around Mercin-Et-Vaux include local historical sites and serve as a gateway to a broader array of cultural and natural points of interest in the Aisne department of France. Within the commune, visitors can find L'ancien Château de Mercin, Église Saint-Léger, and the Jardin des Senteurs. The surrounding region offers significant historical sites like abbeys and castles, alongside extensive forests for outdoor activities. This area provides a blend of historical reflection and natural exploration.
Last updated: June 23, 2026
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Located in the Aisne region, Septmonts Castle was originally the country residence of the bishops of Soissons. Built between the 12th and 16th centuries, it retains several original features, such as the so-called Saint-Louis Room. Visitors can discover a 14th-century keep and square tower, as well as a 16th-century Renaissance pavilion. Bombed during the First World War, Septmonts Castle is now classified as a historical monument for its chapel and keep, and an inscription for the rest of the buildings. The impressive keep is over forty meters high and consists of seven stories of complex architecture. Septmonts Castle itself is adorned with a park featuring an arboretum and an orchard. The entire complex is open to the public, and the Renaissance residence also hosts temporary exhibitions. Every June, the site hosts the Pic'Arts rock festival concerts.
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-1552 Purchase by Jean d'Estrées. -1552-1575 Construction work on the current château. -1573 Birth of Gabrielle d'Estrées in Coeuvres-Valsery. -1575 Death of Jean d'Estrées, grandfather of Gabrielle d'Estrées. -1590 Visit of Henri IV to Coeuvre-Valsery, where he met Gabrielle d'Estrées. -1739, The degraded château passed to the Le Telliers. -1793-1795 Sale as national property, demolition, and division of the estate. -19th century, purchase by the Berthier de Sauvigny family, who carried out extensive restoration work at the end of the 19th century. -1918 Bombings during the Battle of the Marne. -Around 1920, restoration work as war damage. -1953 Sale to the municipality of Madeleine-lès-Lille, which established a summer camp there. -1974 Conversion into a retirement home.
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Inside this pavilion, a large room adorned with a neo-Renaissance fireplace, black and white floor, beamed and joist ceiling decorated with paintings and coats of arms, and low paneling. Two other rooms. A stone spiral staircase. Upstairs, a large, undecorated room, two other rooms. A large attic. On the southeast side, a superb cryptoporticus on which the wooden gallery may have stood, comprises a series of vaulted rooms, including the large kitchens with their superb stereotomy. Beautiful stone slab floors. A second basement level houses flooded galleries. Remains of the staircase pavilion with two semicircular bays, a straight staircase with a ramp under a semicircular vault. To the northeast, the outbuildings wing, largely rebuilt after the First World War, in the center, a porch dwelling topped with a hipped roof, adjoining a staircase turret topped with a dome. Inside, there are a few rare original features, a stone spiral staircase, and a neo-Renaissance fireplace. A lovely volume on the first floor of the porch. Character: Gabrielle d'Estrées. Born in Coeuvres-Valsery in 1573, died in Paris in 1599. A woman with a tumultuous life, whose mother was already described as frivolous, the family of seven sisters was called "the seven deadly sins" by Madame de Sévigné, the father saying that Coeuvres-Valsery was "a rabbit hutch for whores." The family had great social ambitions, and she already held important offices and positions. Gabrielle met King Henry IV at Coeuvres-Valsery in 1590, through her lover. The King courted her ardently, returning especially to Coeuvres-Valsery; after six months, she yielded. He wanted to marry her, even going so far as to announce their marriage publicly at a celebration at the Louvre on February 23, 1599. She died shortly thereafter, on April 10, 1599, carrying the child she had with Henry IV, likely from the effects of her pregnancy, although she showed every sign of poisoning, which long cast doubt on the cause of her death. Henry IV showered the d'Estrées family with titles and offices. Gabrielle's father, Antoine d'Estrées, was Governor of the Île-de-France; her brother, François-Annibal, Bishop of Noyon and French Ambassador to Rome; her sister, Abbess of Maubuisson. Historical origins: -Villiers family
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Hello, Here is the true story of the Château de Coeuvres. For your information, I was born and lived for 20 years in a house opposite Gabrielle's pavilion! Meeting place of Henri IV and Gabrielle d'Estrées in 1590 - An original and dreamlike Renaissance Mannerist festive castle, built for the Dukes of Estrées in the mid-16th century, completed around 1575. Henri IV met Gabrielle d'Estrées there in 1590, the date of the beginning of their romantic and tumultuous affair. Six hectares of land. Although it has the appearance of a fortress, it is a pleasure castle, and more precisely a festive one, given its off-center layout characterized by a small, off-center main building, the presence of four imposing pavilions, and a possibly missing large gallery to the southwest. The ambitious d'Estrées family, which included a French ambassador to Rome, had a festive and social reputation, close to the royal family; Coeuvres-Valsery was elevated to a marquisate and then to a duchy-peerage for them. Of this ambitious complex, built in the second half of the 16th century, close to royal achievements, only vestiges remain, resulting from the demolitions of the Revolution and the bombardment of 1918, while the restoration initiated at the end of the 19th century had just been completed. The setting, curiously located on a marshland, confirms a Baroque choice, which can be explained by Mannerism, a 16th-century school of thought and art with a taste for the strange, the curious, the bizarre, and the original; sometimes going to extremes of incongruity and bad taste. Architecture: A square plan, marked by large dry moats spanned by bridges on both sides, flanked by slightly projecting square corner pavilions. The architecture is beautifully patterned with limestone, and the moat walls are slightly sloped. The most remarkable feature is the Henri IV pavilion to the west, with a square plan topped with a large hipped roof, adjoined by a square stair tower topped with a dome; on the side, a low wing. The windows are mullioned and transomed, with dormers featuring arched pediments. Beautiful moldings on the facades, and windows with bands.
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The Château de Cœuvres dates back to the 16th century and was probably built by a member of the Estrées family, a nobleman renowned since the 15th century. In September 1914, German troops entered the castle, forcing Albert to shelter Ernst Gunther, Duke of Schleswig-Holstein, and the Prince of Saxe-Meiningen. Two weeks later, the Germans were driven out during the First Battle of the Marne, and the castle was occupied by the French 6th Army. General Michel Joseph Maunory established his headquarters there. During World War I, the castle was used by various regiments and served as a hospital. In 1918, during the Second Battle of the Marne, the village and castle were caught in the middle of intense artillery fire and tank battles, which completely destroyed them. Cœuvres Castle is currently closed to the public as it is now used as a retirement home. The west tower is empty. A beautiful castle. It must be special to live there as an older person.
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Great place to discover in the forest
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Possibility to sit on the steps for a meal or a break. Lamp recommended
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Nice setting, this castle housed the German and French general staff? during the 14-18 war. A café right next door to drink (coke) and eat (panini).
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Within Mercin-Et-Vaux itself, you can explore L'ancien Château de Mercin, which now houses the town hall, the Église Saint-Léger, and the Monument aux morts et mémorial d'aviateurs. Just 4 km away, Soissons offers the impressive Saint-Jean-des-Vignes Abbey, a significant Gothic architectural site.
Yes, the region boasts several notable castles. The Septmont Keep, a 47-meter high medieval tower from the 14th century, is a striking example of princely style. You can also visit the Vic-sur-Aisne Castle, which features a 13th-century keep. Further afield, Château de Pierrefonds (21 km) and Château Coucy (17 km) are considered among the most beautiful castles in northern France.
You can enjoy the tranquil Jardin des Senteurs next to the town hall in Mercin-Et-Vaux. The repurposed old train station, Ancienne gare de Mercin - Pommiers, now serves as a greenway for walks. For more extensive natural exploration, the large forests of Foret de Retz, Forêt de Laigue, and Forêt de Compiègne are all within 18-29 km, offering opportunities for walks and outdoor activities.
Many historical sites are suitable for families. The Septmont Keep and its park, as well as the Ruins of the Abbey of Notre-Dame de Longpont, are marked as family-friendly. The Vic-sur-Aisne Castle also welcomes families to explore its grounds and gardens.
The region around Mercin-Et-Vaux is excellent for various outdoor activities. You can find numerous routes for road cycling, running, and mountain biking. For example, there are road cycling routes like the 'Vic-sur-Aisne Castle loop from Soissons', running trails such as the 'Pommiers – Saint-André Church of Belleu loop from Mercin-et-Vaux', and MTB trails like the 'Mire – Vic-sur-Aisne Castle loop from Mercin-et-Vaux'. You can find more details on these activities in the dedicated guides for Road Cycling Routes, Running Trails, and MTB Trails.
Yes, for those interested in World War I history, the Carrières de Confrécourt are a significant site. These underground quarries served as a refuge for French soldiers and feature carvings and frescoes on the walls. Guided tours are available on the first Sunday of each month from April to September, by reservation.
A unique natural feature is Le fond Guesot in Fontenoy. These caves are part of a natural site and are home to rare hibernating bats and prehistoric carvings. Access requires special permission from the Conservatoire des Sites Naturels de Picardie, but you can admire them from the outside.
Visitors frequently appreciate the rich historical ambiance and the opportunity to explore medieval architecture. For instance, the Septmont Keep is valued for its impressive structure and the peaceful park surrounding it, ideal for picnics. The Ruins of the Abbey of Notre-Dame de Longpont are noted for their dramatic Gothic architecture and quiet atmosphere, offering a reflective experience.
The spring, summer, and early autumn months generally offer the most pleasant weather for outdoor activities like walking, cycling, and exploring historical sites. The extensive forests and greenways are particularly enjoyable during these seasons. Some specific attractions, like the Carrières de Confrécourt, offer guided tours from April to September.
Absolutely. You can visit the Ruins of the Abbey of Notre-Dame de Longpont, a former Cistercian abbey founded in 1131, which offers a glimpse into medieval religious architecture. Additionally, the Abbey of Notre-Dame at Morienval, about 27 km away, is an impressive example of Romanesque architecture.
Yes, the area offers a range of walking and running trails. For example, the 'Pommiers loop from Mercin-et-Vaux' is a moderate 6 km running trail. While specific difficulty levels for walking trails aren't detailed for every attraction, the greenway at Ancienne gare de Mercin - Pommiers provides an easy option, and the surrounding forests offer varied terrain for longer walks.


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