Best natural monuments around Sennheim are found in the picturesque Alsace region of France, offering a diverse natural landscape. Sennheim, also known as Cernay, is situated near significant portions of the Ballons des Vosges Regional Nature Park, which spans over 3,000 km². This area features varied ecosystems, including high-altitude pastures, extensive forests, and unique wetlands. The region's geology, ranging from granite to limestone, contributes to its distinct character and ecological importance.
Last updated: July 2, 2026
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The castle was built from 1224, with various extensions until the 16th century. Its initial purpose, in addition to being the residence of the Count of Ferrette, was to monitor the toll which regulated passage into the Thur valley. Its name means the “town of the angel” in homage to Saint Michael, chief of the angels and champion of Good, and it stands at the top of the Schlossberg, the “castle mount. » In 1673, Louis The king called on miners from Giromagny to demolish the castle with explosives. When the dungeon collapses, part of it remains stuck on the side, giving the ruins their current shape. The locals nickname the remains of the castle “The Witch’s Eye” because this dungeon evokes an eye watching over the city, but also in connection with the tumultuous past involving the city in witch hunting. Family walk through the old town offering upon arrival a beautiful view of the town and the surrounding hills.
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A worthwhile destination, good view of the city
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The preservation over the many years is unique
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The “Roche Sermet” is a rock formation located on the Hartmannswillerkopf¹ battlefield. It is located at an altitude of approximately **910 meters**². Hartmannswillerkopf, also known as Vieil Armand, is a pyramidal rocky spur in the Vosges massif, overlooking the Alsace plain from its 957 meters¹. During the First World War, it was a strategic summit hotly contested by the French and German armies¹. Today, the Hartmannswillerkopf is a place of memory, bearing witness to the suffering of the soldiers who fought in the name of their country¹. The German remains encountered on the ground, sometimes quite spaced apart from each other, are witnesses to this historical period¹. Source: conversation with Bing, 05/07/2024 (1) HWK: Vestiges of the Past - e-monsite. https://hartmannswillerkopf.e-monsite.com/pages/hwk-vestiges-du-passe.html. (2) Presentation. https://hartmannswillerkopf.e-monsite.com/pages/presentation.html. (3) The Hartmannswillerkopf | Paths of memory. https://www.cheminsdememoire.gouv.fr/en/hartmannswillerkopf. (4) The Hartmannswillerkopf - Official website. https://www.memorial-hwk.eu/.
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A treat from the Thann Valley. Beautiful asphalt, a clear view of the Grand Balloon 🎈 in the first bends and accessible percentages. Perfect !
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We, the Kemnather Land team, also tortured ourselves like crazy ;-) on our 4-day tour to Lörrach. It was nice!
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A fallen tower as the central photo motif.
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The approach from Bitschwiller-lès-Thann has an elevation gain of 400 meters over 6.2 kilometers. A maximum gradient of 13%. But it is relatively uneven, so it is not that easy to ride.
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Beyond the well-known Hartmannswillerkopf National Monument, visitors highly appreciate the The Witch's Eye (Engelbourg Castle) for its unique ruin and magnificent views of Thann. Another favorite is the Viewpoint at the summit of Vieil Armand, offering extensive views of the Alsatian and Upper Rhine plains, and the Vosges Mountains.
Yes, the Hartmannswillerkopf National Monument is considered family-friendly, offering both natural beauty and historical significance. Additionally, the Cernay Stork Park is a wonderful place for families to observe storks, an emblem of Alsace, with about 60 permanent residents and many births each year. The Thur Banks Park (Parc des Rives de la Thur) also provides paths, picnic spots, and games perfect for a leisurely family day outdoors.
The Sennheim area, situated near the Ballons des Vosges Regional Nature Park, offers a rich diversity of natural features. You can explore high-altitude pastures, extensive forests (beech, fir, oak, pine), unique peat bogs, rivers, and lakes. The region's geology, ranging from granite to limestone, contributes to its distinct character, supporting varied ecosystems and abundant wildlife.
Many natural monuments in the Sennheim area are deeply intertwined with history, particularly World War I. The Hartmannswillerkopf National Monument, also known as Vieil Armand, is a significant site of remembrance and reconciliation, where 30,000 French and German soldiers died. The Viewpoint at the summit of Vieil Armand also marks a key historical location from the war, with preserved trenches and bunkers.
The region around Sennheim is ideal for various outdoor activities. You can find numerous mountain hikes, including routes around the Hundsruck Pass. For cyclists, there are challenging touring bicycle routes, such as those leading to the Grand Ballon. Mountain biking enthusiasts can explore MTB trails with views of the Thann Valley.
Yes, the Cernay Stork Park is a key site for wildlife observation, specifically for storks, which are a symbol of Alsace. You can observe these iconic birds flying freely around the town and returning to the park. The Michelbach Dam and Nature Reserve also offers a 4 km walking trail with observatories, providing opportunities to spot numerous bird species like cormorants, ospreys, and crows.
For breathtaking panoramic views, visit the Viewpoint at the summit of Vieil Armand, which offers vistas of the Alsatian and Upper Rhine plains, and the Vosges Mountains. The The Witch's Eye (Engelbourg Castle) also provides a magnificent view of the city of Thann. Further afield, the Grand Ballon d'Alsace, the highest peak in the Vosges, offers expansive views, even reaching the Bernese Alps on clear days.
The Michelbach Dam and Nature Reserve is a protected area near Sennheim, featuring a dam built to regulate the water table and supply drinking water. It's an approved voluntary nature reserve with a 4 km walking trail. Visitors can enjoy splendid views of Vosges summits like Rossberg and Grand Ballon from various observatories, and it's an excellent spot for birdwatching.
The best time to visit depends on your preferred activities. Spring and autumn offer pleasant temperatures for hiking and cycling, with beautiful foliage in autumn. Summer is ideal for enjoying the outdoors, though it can be busier. Winter provides a different, often serene, experience, especially in the higher elevations of the Ballons des Vosges Regional Nature Park, though some paths might be less accessible.
The Ballons des Vosges Regional Nature Park, which surrounds Sennheim, is characterized by diverse geology. The 'ballons' themselves are rounded peaks, older and more eroded than the Alps, shaped by ancient geological processes. The park features a transition from granite to limestone, influencing the landscape and local agriculture. The Mille Étangs (Thousand Ponds) Plateau, with its approximately 850 ponds, is a unique landscape formed by glacial activity over 12,000 years ago.
Visitors frequently highlight the stunning panoramic views, especially from sites like the Viewpoint at the summit of Vieil Armand and The Witch's Eye (Engelbourg Castle). The blend of natural beauty with profound historical significance, particularly at the WWI sites, is also deeply appreciated. Many enjoy the diverse hiking opportunities and the chance to experience the tranquility and rich biodiversity of the Ballons des Vosges Regional Nature Park.
While not entirely 'hidden,' the Roche Sermet offers a less-frequented outpost with wonderful views of the Grand Ballon, providing a more secluded experience compared to the main WWI memorials. The tranquil Mille Étangs (Thousand Ponds) Plateau within the Ballons des Vosges Regional Nature Park is also a unique and serene area for nature lovers seeking a quieter exploration.


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