Best caves around Vielsalm are found in a region characterized by the natural beauty of the Belgian Ardennes. This area is known for its diverse geological features and historical significance, particularly related to its mining past. The landscape around Vielsalm offers a mix of natural formations and man-made underground sites. It serves as a base for exploring both local geological curiosities and the wider Ardennes cave systems.
Last updated: May 3, 2026
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The slate quarries of Cahay were located here. The slates of the ‘Pays de Salm’ have long been known and appreciated. For instance, in 1513, the people of Amberloup came here to fetch slates to build their church. A text from 1625 states that “use and the sun harden them to such an extent that the nails used to fasten them are affected by rust, while they (the slates) remain intact”. These very high-quality slates were initially mined in large open-pit mines, which left behind the large pits that we can still see in the landscape. From the second half of the 19th century, the extraction of slate took place via tunnels in the higher-quality layers of the “Thier des Carrières” mountain where you are standing now. The “waste” was dumped in heaps that were subsequently used for all kinds of works (roads, walls, etc.). The large slates with rounded edges are particularly well-known: these are the hérbins, always laid in diagonal lines. They can still be seen on the roofs of old houses in the Pays de Salm. After sawing, the phyllade (schist hardened by (underground) high pressure and temperatures) yielded material for billiard tables, window sills, etc. These slate quarries provided work for numerous laborers in our region. Some were highly specialized, such as the splitters who, after two to three years of practice, were capable of producing slates 3-4 mm thick. (Vielsalm Tourist Office)
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Many mine tunnels run underground here. To gain access to the good layers, the Salm miners sometimes dug long tunnels through the hard rock. The resistance of the rock is so great that the tunnels did not need to be supported. They were equipped with rails on which carts brought the blocks coming out of the mine to the surface. The chambers in which the blocks were loosened were very large: it was said that the church of Vielsalm could stand in the largest chamber. The workers carefully loosened the blocks along the natural fractures of the slate. As long as the rock was wet, the blocks split easily; they were therefore covered with wet sacks to keep them “fresh.” Similar galleries, though shorter, were also dug elsewhere to extract coticule, also called “razor stone.” The galleries followed the very narrow and winding veins. To ensure sufficient light, the miners used lamps for a long time that speleologists still use today. (Vielsalm Tourist Office)
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Class cycle paths Luxembourg and Belgium
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The Vennbahn border tunnel between Belgium and Luxembourg is closed to protect the winter quarters of rare bat species. The path to the tunnel is beautifully designed with bat information boards. The detour of about a kilometer there (and back) on the Belgian side to the gate at the tunnel entrance is worth it. Shortly before the tunnel entrance it suddenly becomes quite cold.
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We can't really recommend it. You drive about 1 km off the main path and then end up in front of a gate in front of the tunnel, which is closed. You can save yourself the detour.
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there were very tame bunnies around when I was there, very cute
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Terrific climate in summer at over 30 °. On the way there in the cool, cooling down is guaranteed. A dream. You have to experience it.
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Very well organized gravel tour.
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Near Vielsalm, you'll find a mix of historical mining tunnels, natural grottoes, and unique geological formations. These include remnants of ancient slate quarries, bat habitats, and rare rock formations. The wider Ardennes region, for which Vielsalm is a good base, also offers spectacular natural show caves.
While large natural 'show caves' are more prominent in the wider Ardennes, Vielsalm and its immediate surroundings feature smaller natural formations and historical underground sites. The Neidinger Grotto of the Virgin Mary is a natural grotto with religious significance, offering a peaceful spot for visitors.
The region's industrial past is visible in sites like the Ancient Quarry and Abandoned Tunnel and the Mine Entrance of Thier des Carrières. These are remnants of historic slate quarries, offering a glimpse into how workers extracted slate and coticule, with vast underground chambers.
Yes, you can. The Malmedy Puddingstone, located near Basse-Bodeux, features small caves within a unique rock formation. This 'pudding stone' is rare in Belgium, resembling a compact mass with embedded pebbles, and dates back millions of years, offering fascinating geological insight.
Yes, some sites are family-friendly. The Malmedy Puddingstone is noted as family-friendly, and the Neidinger Grotto of the Virgin Mary offers a calm, accessible spot. For a broader experience, the famous Caves of Han in the wider Ardennes region are a comprehensive day out with a wildlife park.
The Bat Tunnel near Huldange serves as a crucial winter habitat for rare bat species. The path leading to it has informative boards about bats, and you can experience a noticeable temperature drop near the entrance, making it an interesting spot for nature enthusiasts.
For those willing to travel a bit further, the Ardennes offers several renowned cave systems. These include the spectacular Caves of Han, known for their massive formations and underground river, the Caves of Remouchamps with their unique underground boat tour, and the pristine Caves of Hotton.
The Vielsalm area is excellent for outdoor activities. You can find numerous hiking trails, such as the Sacrawé LIFE Circuit or routes around Lac des Doyards. There are also great options for road cycling and running trails, allowing you to explore the natural beauty of the Belgian Ardennes.
Visitors appreciate the historical insights offered by the old slate quarries, the unique natural features like the Malmedy Puddingstone, and the peaceful atmosphere of sites like the Neidinger Grotto. The cool climate near the Bat Tunnel near Huldange is also a highlight, especially in summer.
The Bat Tunnel near Huldange is a winter habitat for rare bat species, so the tunnel itself is closed to protect them. However, the path leading to it is beautifully designed with informative boards about bats, and you can experience a significant drop in temperature near the entrance. It's a worthwhile detour for nature lovers.
Yes, the Neidinger Grotto of the Virgin Mary offers a peaceful and contemplative space. It features a figure of Mary and benches, making it a nice spot to relax and reflect.
The best time to visit depends on the specific site. For sites like the Bat Tunnel near Huldange, the path is accessible year-round, with the temperature drop being particularly noticeable in summer. For larger show caves in the wider Ardennes, spring to autumn generally offers the most pleasant conditions and full operating hours.

