Best caves around Demerath are found within the wider Vulkaneifel and Gerolstein regions, an area characterized by its volcanic origins and diverse geological formations. This landscape features a mix of natural rock caves and historical mining tunnels, offering insights into both ancient geological processes and human industrial heritage. The region provides opportunities for exploring unique underground environments. These sites reflect the area's rich past, from prehistoric human activity to industrial mining operations.
Last updated: June 27, 2026
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1 million years of geology. Worth putting your bike aside for a moment.
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surprising sight when walking the theme path in our direction
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The Ulmener Maar tunnel connects the Ulmener Maar with the Jungferweiher Maar and is 120 meters long and 70 cm wide at its narrowest point. Different rock layers from the volcanic history can be seen. Display boards and paintings on the tunnel make the history very interesting. The tunnel was used to channel water from the two maars into the Ulmener Bach to the mills. Next to the tunnel, two drains and bulkheads are used to regulate the water level.
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Information about the Maar Stollen can be found, for example, at https://www.gesundland-vulkaneifel.de/ulmener-maar-stollen-entdecker-tour/#:~:text=Ulmen%20neu%20erleben&text=Den%20Maar%2DStollen%20kannst %20you, just%20once%2070%20cm%20wide. find
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The whole thing is worth seeing and you can also take a break and relax here
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It's called the Ulmen Maar Tunnel and connects the Jungferweiher pond and the Ulmen Maar. The tunnel is finished and has been open to the public since April 25, 2023. It's turned out simply fantastic. A visit is definitely worthwhile. It's open in the summer months from 6 a.m. to 8 p.m. In winter, it's also open during the day. The circular and hiking trail around the Jungferweiher pond and the Ulmen Maar is wheelchair accessible. Cycling through the tunnel is prohibited, as the tunnel is only 70 centimeters wide at its narrowest point. You don't need to be claustrophobic. A visit to the Ulmen Castle ruins, with its fantastic view over the town of Ulmen and the Ulmen Maar, is also highly recommended.
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The Ulmener Maarstollen was completed in 2023 and connects the Jungferweiher with the Ulmener Maar. Hopefully it stays as clean and beautiful as it was when I visited yesterday.
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The region around Demerath, particularly the wider Vulkaneifel and Gerolstein areas, offers a mix of both natural rock caves and historical mining tunnels. You can find caves formed by ancient geological processes, as well as those created by human activity for millstone or slate extraction.
Yes, the Buchenlochhöhle in the Gerolstein Dolomites is a notable natural rock cave. It was formed by groundwater over millions of years and offers a glimpse into prehistoric human activity.
Many caves in the region provide deep historical insights. For instance, the Millstone Cave at Nerother Kopf showcases medieval mining practices, while the Buchenlochhöhle has evidence of Neanderthal and Neolithic inhabitants, and even served as a refuge during World War II. Mining tunnels like the Matthias-Josef Stollen Slate Mine and the Bergkrone Mine Tunnel highlight the industrial heritage of the area.
The Millstone Cave at Nerother Kopf is an artificial cave system created by centuries of millstone extraction from volcanic rock. Visitors can still see unfinished millstone blanks on the cave walls, offering a unique insight into medieval mining. It's unlit, so a flashlight is required, and the temperature is consistently around 6 degrees Celsius.
Yes, the Birresborn Ice Caves are known for their consistently low temperatures (between -1°C and +4°C), which allows icicles and ice columns to persist well into the summer after cold winters. These caves were originally basalt mines.
The Buchenlochhöhle is renowned for its natural formation within the Gerolstein Dolomites and its rich history of human use, including by Neanderthals and as a refuge during WWII. It's freely accessible year-round, though it requires climbing a narrow, steep wooden staircase.
The Matthias-Josef Stollen Slate Mine is categorized as family-friendly. Additionally, the Gillenfeld Mariengrotte, a grotto built from lava, is also considered family-friendly.
For caves like the Millstone Cave at Nerother Kopf and the Birresborn Ice Caves, warm clothing is highly recommended due to low temperatures (around 6°C or even colder). Sturdy shoes and a flashlight or torch are essential for exploring unlit sections and navigating uneven terrain in many of the caves, including the Buchenlochhöhle.
The region around Demerath offers various outdoor activities. You can find numerous road cycling routes, such as those detailed in Road Cycling Routes around Demerath, and general cycling tours in Cycling around Demerath. For mountain biking enthusiasts, there are MTB trails available, which you can explore in MTB Trails around Demerath.
Yes, many caves are integrated into scenic hiking routes. For example, the Buchenlochhöhle can be reached via trails like the Gerolsteiner Felsenpfad and the Eifelsteig. The Bergkrone Mine Tunnel is also a point of interest for hiking and cycling routes in its vicinity.
Most caves are accessible year-round, but some have specific considerations. The Birresborn Ice Caves, for instance, are closed from October to March to protect bats during their winter hibernation. For unlit caves, visiting during daylight hours is advisable, and always bring a flashlight. The consistently cool temperatures inside make them a refreshing escape during warmer months.
While specific parking details for each cave are not always provided, caves located along popular hiking and cycling routes, such as the Bergkrone Mine Tunnel, typically have designated parking areas nearby or are accessible from trailheads with parking facilities.
This historical site features the entrance to the Juliusstollen, where visitors can enter a few meters before an iron door blocks further passage. It's also home to the Kaulenmännchen Sculpture, which depicts a legendary figure associated with the mine, adding a unique cultural and storytelling element to the visit.


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