Caves around Altthann are primarily historical sites, often integrated into the natural landscape of the Vosges mountains. The region features remnants from World War I, including fortified rock structures and underground passages. These sites offer a combination of historical exploration and natural features, providing insight into the area's past. The terrain around Altthann is characterized by its mountainous setting, with many of these "caves" being man-made or adapted natural shelters.
Last updated: June 22, 2026
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The "Veilchenstein" is a German shelter located on the Hartmannswillerkopf¹ battlefield. This shelter, built into a rock, is equipped with a machine gun post and observatories¹. 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. (1). https://bing.com/search?q=veilchenstein+harmannswillerkopf. (2) The Hartmannswillerkopf - Official website. https://www.memorial-hwk.eu/. (3) Hartmannswillerkopf - Wikipedia. https://fr.wikipedia.org/wiki/Hartmannswillerkopf.
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The Adlerhorst is a German shelter located on the Hartmannswillerkopf³ battlefield. This two-story shelter is built into a rock³. It is equipped with a machine gun post, observatories and a fountain³. Hartmannswillerkopf, also known as Vieil Armand, is a pyramidal rocky spur in the Vosges massif, overlooking the Alsace plain from its 956 meters². During the First World War, it was a strategic summit hotly contested by the French and German armies². Today, the Hartmannswillerkopf is a place of memory, bearing witness to the suffering of the soldiers who fought in the name of their country³. The German remains encountered on the ground, sometimes quite spaced apart from each other, are witnesses to this historical period³. (1) The Hartmannswillerkopf – German positions – By hills and by forts. https://parmontsetparforts.fr/2024/03/17/hwk-positions-allemandes/. (2) The Hartmannswillerkopf - Official website. https://www.memorial-hwk.eu/. (3). https://bing.com/search?q=adlerhorst+810+hartmannswillerkopf.
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The “Roche Fendue” is a rock formation located on the Hartmannswillerkopf battlefield¹. It is located to the north of the HWK, below the Silberloch Pass, at around 750 meters above sea level³. The French fortified this rock during the First World War by digging an underground gallery approximately 20 meters long³. Above the Roche Fendue, a trench leads to an observation post offering a view of the Freundstein, the Grand-Ballon, the Hartfelsen, the Südelkopf and the Thierenbachkopf¹. These fortifications are among the many vestiges of the trench warfare which lasted from the end of 1914 to July 1918 on the Hartmannswillerkopf¹. Today, these sites are places of memory, witnesses to the suffering of soldiers who fought in the name of their country¹. (1) The Hartmannswillerkopf – French positions – By Mountains and by Forts. https://parmontsetparforts.fr/2024/03/24/hwk-positions-francaises/. (2) HWK: Observatories - e-monsite. https://hartmannswillerkopf.e-monsite.com/pages/hwk-les-observatoires.html. (3) To do: The northern trenches of Hartmannswillerkopf - Hiking. https://www.visorando.com/randonnee-les-tranchees-nord-du-hartmannswillerkop/.
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During the First World War, this rock massif was expanded into a strong, self-sufficient fortress. Over time, the hilltop was completely hollowed out with a large number of tunnels and rock chambers.
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Very nice view of the underground passages.
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A fortified natural rock that can be accessed from several levels. even the hiking trail leads through one of the rooms.
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For people of our size today, it is hard to imagine how grown men dug for lead here. This mine is a must for anyone interested in history and archeology!
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The path over the Rehfelsen is littered with old bunkers and trenches
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The 'caves' around Altthann are primarily historical sites, often integrated into the natural landscape of the Vosges mountains. Many are remnants from World War I, including fortified rock structures and underground passages, or historical mines. They offer a unique blend of historical exploration and natural features, rather than traditional geological caves.
Yes, the region is rich in World War I history. You can explore sites like the Adlerhorst Command Post – World War I, an exciting rock fortress with steps, rooms, gun positions, and battlements. Another significant site is the Veilchenstein German WW1 Bunker, a German position consisting of bunkers, tunnels, and trenches built into the rock.
Yes, some sites are accessible via hiking trails. For instance, the Lower Rehfelsen Tunnels are a fortified natural rock that can be accessed from several levels, with a hiking trail leading directly through one of its rooms. This site also offers great views over the Rhine plain.
Absolutely. The Schletzenbourg medieval mine is a notable historical mine and quarry. Here, you can explore underground passages where men once dug for lead, offering a glimpse into historical mining conditions and the scattered caves in the sector.
Many of the historical cave sites are situated in the mountainous Vosges region, offering impressive vistas. From the Lower Rehfelsen Tunnels, you can enjoy great views over the Rhine plain. Similarly, the Adlerhorst Command Post – World War I is at lofty heights within the Vosges mountains, providing spectacular natural scenery.
The region around Altthann offers a variety of outdoor activities. You can find numerous hiking trails, such as those detailed in the Hiking around Altthann guide, with routes like the 'Himmelstein Viewpoint – Chapelle de la Loh loop'. There are also Road Cycling Routes and Running Trails available in the area.
Visitors particularly appreciate the unique combination of history and nature. The well-preserved World War I fortifications and medieval mines offer a profound historical experience, while their integration into the natural rock formations and mountainous landscape provides stunning views and a sense of adventure. The komoot community has contributed over 20 photos and 15 upvotes, highlighting the appeal of these sites.
Many of the sites, such as the Lower Rehfelsen Tunnels, are accessible via hiking trails, making them suitable for those with an intermediate fitness level. Some historical bunkers and tunnels may require caution due to uneven terrain or potential rockfall, so it's always best to be prepared and aware of your surroundings.
Given that many sites involve hiking and exploring historical structures, comfortable hiking shoes with good grip are recommended. Layers of clothing are advisable as temperatures inside tunnels or rock shelters can be cooler than outside. A headlamp or flashlight can also be useful for exploring darker passages.
While specific 'family-friendly' categories aren't listed, the historical sites offer an educational and engaging experience for families interested in history and outdoor exploration. Sites like the Adlerhorst Command Post – World War I provide an exciting look into the past with its steps, rooms, and battlements, which can be fascinating for older children. Always assess the difficulty and safety for younger family members.
The Vosges mountains, where these sites are located, are generally pleasant for outdoor activities from spring through autumn. Visiting during these seasons ensures more favorable weather for hiking and exploring the outdoor aspects of the historical sites. Winter visits might be possible, but some trails could be challenging due to snow or ice, and access to certain areas might be limited.


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