Caves around Glees are primarily found in the volcanic Laacher See region, characterized by its unique geological features. This area features a mix of natural shelters and historically significant human-carved lava caves, often remnants of past mining activities. These subterranean spaces offer insights into both the region's volcanic past and human ingenuity in utilizing natural resources. The terrain around Glees provides diverse opportunities for exploring these distinctive underground formations.
Last updated: August 18, 2026
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The Trass Caves in the Brohl Valley are deep, branching cave passages made of volcanic trass rock – formed around 13,000 years ago by the eruption of the Laacher See volcano.
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On the 🧡Dream Trail, dotted with many highlights, this is a real outdoor highlight, practically an adventure playground for adults: Impressive large trass caves...- Endless photo opportunities beckon here📸🎨🖌. Pleasantly cool & refreshing, especially in the warmer summer season🌞🌡. There are also numerous free parking spaces, some of them shaded, next to the large 🚂viaduct🌞🌡
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The freely accessible trass caves in the Brohltal are located below Bad Tönisstein on the Brohltalstraße (Federal Highway 412) at the height of the "Jägerheim" inn. The caves were formerly used by the trass millers: they had the raw material, the freshly cut trass "arks", dried there.[1] There are parking spaces for cars near the caves. The Kell Cave and Gorge Trail, a circular hiking trail, leads past the trass caves. Source: https://www.aw-wiki.de/index.php/Trassh%C3%B6hlen_im_Brohltal
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A photogenic relic of an old mill is this water wheel on a tributary of the Nette.
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Great cave passages, don't forget your flashlight
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It's a shame that the Sandkaul Caves are used by some people as a dumping ground for their garbage.
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Genoveva Cave However, this one is no match for the cave of the same name in Kordel near Trier🧭❣️ Still very interesting🖤 Dark, take a flashlight 🔦 with you to explore the cave for a few meters. 🖤Super interesting outdoor fun 🖤
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The Sandkaul near Ettringen in the Volcanic Eifel.🖤 This former volcanic rock mining area is located on the edge of the Hochstein volcano, north of Ettringen on the L 82 highway, about 500 meters past the end of the village.🖤 Sad background: 🪖During World War II, the Ettringen caves were drilled into the rock...to protect against attacks🧨... 😑🙏🏼
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The region around Glees is known for its unique geological features, primarily featuring human-carved lava caves, natural shelters, and historical mining tunnels. These subterranean spaces offer insights into both the area's volcanic past and human ingenuity in utilizing natural resources.
Yes, the region is rich in historical caves. For instance, the Genoveva Cave is a historical site and natural monument that even served as a filming location for a fairy tale. The Sandkaul Caves near Ettringen are a former volcanic rock mining area, where small caves were used for protection during World War II. Similarly, the Sieben Stuben Lava Caves also served as protection against air raids during WWII.
Absolutely. Several caves are suitable for families. The Trass Caves Brohltal offer a jungle atmosphere that children often enjoy. The Sandkaul Caves near Ettringen are also considered family-friendly, providing a glimpse into historical mining. Additionally, the Sieben Stuben Lava Caves are described as fun for the whole family to explore.
You'll encounter diverse natural features, especially those shaped by volcanic activity. The Trass Caves Brohltal feature mighty rock faces and a unique jungle-like atmosphere. From the Genoveva Cave, you can enjoy a beautiful view of Lake Laach from a small viewing platform. The region's volcanic rock formations are a consistent theme across many of these sites.
For exploring some of the deeper or darker passages, such as the Trass Caves in the Brohl Valley – Deep Cave Passages or the Sieben Stuben Lava Caves, a headlamp or flashlight is highly recommended to navigate the low and dark shafts safely.
While the provided data doesn't explicitly mention guided tours for all caves, the Mendig lava caves, which are part of the larger Vulkanpark Osteifel/Laacher See, often offer guided tours. These tours provide educational insights into the geological context and historical human endeavor of the region's subterranean spaces.
Yes, the area around Glees offers many opportunities for outdoor activities. You can find various cycling routes, including those around Lake Laach, by checking the Cycling around Glees guide. For gravel biking, explore routes like the Lake Laach loop from Wassenach in the Gravel biking around Glees guide. There are also mountain hikes, such as the Lake Laach loop from Abteikirche, detailed in the Mountain Hikes around Glees guide.
Visitors frequently appreciate the unique blend of geological interest and historical significance. The mighty rock faces and 'jungle atmosphere' of the Trass Caves Brohltal are often highlighted. The historical context of sites like Genoveva Cave and the insights into past mining practices at Sandkaul Caves near Ettringen are also highly valued. Many enjoy the opportunity for exploration and the scenic views, such as those overlooking Lake Laach.
The provided information does not indicate that general permits are required for visiting the publicly accessible caves mentioned, such as the Trass Caves Brohltal or Genoveva Cave. However, for any specialized or off-trail caving, it's always advisable to check with local authorities or visitor centers for specific regulations.
The caves, particularly the human-carved lava cellars, maintain a consistently cool temperature year-round, making them a good destination even in warmer months. For outdoor activities combined with cave visits, spring and autumn generally offer pleasant weather conditions for hiking and cycling in the surrounding volcanic landscape.
Yes, the Genoveva Cave features a small viewing platform above it, offering a beautiful view of Lake Laach. Additionally, the area around the Sieben Stuben Lava Caves on the Kottenheimer Büden provides great views of Kottenheim.


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