Best caves around Kelmis are primarily linked to the region's historical zinc mining activities. Kelmis, known for its past as Neutral Moresnet, features a landscape shaped by industrial heritage and natural conservation areas. The area offers opportunities to explore former mining sites and man-made underground passages. These sites provide insights into the region's geological and industrial history.
Last updated: June 30, 2026
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In the mid-19th century, flooding from the Göhl River posed a major threat to the mine in Bleyberg/Plombières: Water repeatedly penetrated the tunnels and claimed lives. To prevent this, a diversion of part of the river was requested and approved in 1861. By 1862, a tunnel several hundred meters long was built beneath the rock, keeping the Göhl away from the mine. The construction cost approximately 200,000 francs. The tunnel is a technical monument to mining engineering from an era when hazards were deliberately controlled while simultaneously harnessing hydropower. It demonstrates how work-related accidents were prevented while simultaneously harnessing resources.
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Small cave with bat passage..
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Bats hibernate from early November to the end of March. Please leave the animals alone during these five months. Thank you.
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Bats 🦇 are allowed to fly in and out
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The site of the former Plombières mine is home to species-rich calcareous grassland meadows, now protected as a nature reserve. The exceptional flora and fauna of this area are due to the heavy metal-rich soils, particularly the presence of zinc in the subsurface. Among the natural meadow relics, visible traces of the former metal industry can still be found: – Walls from former foundry floors – Remains of old smelting furnaces – Stones from former industrial buildings A small stream meandering through the area further enriches the ecological diversity of this special place. The "Gueule" viewpoint, which offers a glimpse into a cave opening, is particularly impressive and worth a visit.
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Hardly anything can be seen here.
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Park with "the house of the mining site", playground, information boards, picnic areas, sanitary facilities, direct access to the nature reserve and more. Info about the "Maison du Site Minier" at https://www.komoot.com/nl-nl/highlight/1038492
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The beaver can also be found here, on the Belgian side of the Geul (Gueule). At least one is active next to the boardwalk that leads to the man-made cave the stream disappears into and a stone's throw from that cave.
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The 'caves' around Kelmis are primarily linked to the region's historical zinc mining activities. You'll find a landscape shaped by industrial heritage, featuring former mining sites, man-made underground passages, and natural cave entrances that are often protected as bat habitats. These sites offer insights into the region's geological and industrial past, rather than extensive natural cave systems like those found in the Ardennes.
Traditional natural caves with extensive formations, such as those in the Ardennes, are not found in Kelmis. The region's underground heritage focuses on its historical zinc mines and man-made diversions. For spectacular natural caves, you would need to travel to the Ardennes region, for example, to the Caves of Han.
The underground sites in Kelmis are deeply tied to the region's rich mining history, particularly the Altenberg Mine, which was once Europe's largest calamine (zinc ore) mine. Sites like the Mine entrance and Geul sinkhole — Plombières Nature Reserve and the Oskar Tunnel (Oskarstollen) are remnants of this industrial past, showcasing how ore was extracted and transported. The Vieille-Montagne Museum in Kelmis further details this history, including the unique political status of Neutral Moresnet.
Yes, the Mine entrance and Geul sinkhole — Plombières Nature Reserve is considered family-friendly. While you can't enter the deep mine, you can view a cave opening and explore the surrounding nature reserve with its unique flora. The Vieille-Montagne Museum also offers an interactive experience suitable for families to learn about the mining history.
While many historical mining tunnels exist, direct public access for exploration is often restricted for safety or conservation reasons. For example, the Oskar Tunnel (Oskarstollen), a 500-meter long former ore transport tunnel, now serves as a habitat for bats and is not open for general exploration. You can often view entrances or learn about them through interpretive panels in conservation areas.
The 'Lime kiln' highlight, also known as the Artificial Tunnel of the Gueule River, is an underground passage where the river disappears into the mountain. This is not a natural cave but an artificial creation from 1861. It was built to divert the Geul river and prevent it from flooding the nearby mine shafts, making it a significant part of the region's mining infrastructure and a picturesque spot today.
Yes, the Grube Auberg Bat Cave Entrance is a notable site. It features a barred cave entrance that protects a bat habitat. While you cannot enter, you can observe the entrance and sometimes see a small stream inside. The Oskar Tunnel (Oskarstollen) is also known as a bat habitat.
The areas around the cave sites in Kelmis, particularly the Altenberg Conservation Area and Plombières Nature Reserve, offer excellent opportunities for outdoor activities. You can enjoy various hiking trails, such as those found in the Mountain Hikes around Kelmis guide. There are also options for Gravel biking and Road Cycling in the wider region.
The best time to visit the cave-related sites and surrounding nature reserves in Kelmis is generally during spring, summer, and early autumn. These seasons offer pleasant weather for exploring the outdoor areas and hiking trails. Some sites, like bat habitats, may have specific quiet periods to protect the wildlife, so it's always good to check local information if planning a visit focused on wildlife observation.
While the historical mining sites themselves are generally not accessible for guided underground tours in the traditional sense, the Vieille-Montagne Museum in Kelmis offers an interactive experience with exhibitions and audio guides that delve into the history of the zinc mining operations and the region's past. This provides a guided learning experience about the underground heritage.
Beyond the cave-related sites, Kelmis is rich in history. The Vieille-Montagne Museum is a key landmark, offering deep insights into the region's mining past and the unique history of Neutral Moresnet. The Altenberg Conservation Area, with its hiking paths and information panels, also provides a chance to explore the landscape shaped by mining activities.


Extend your search for the best caves by checking out these guides of the top ones around Kelmis: