Best caves around Probstzella are found in a region known for its historical mining landscape within the Thuringian Slate Mountains. This area features a mix of natural geological formations and former mines repurposed for exploration. The underground sites offer insights into both natural processes and the industrial heritage of slate and alum mining. Visitors can explore various types of subterranean environments, from show caves to historical mine tunnels.
Last updated: June 27, 2026
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The first hall can also be viewed from the second opening and the first hall (back right). I don't dare go to the front because of my fear of heights. There's supposed to be a lake/waterfall at the bottom.
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You don't have to crawl over the elevation. After that, things get spectacular. There are several large halls. Unfortunately, they're empty. Be careful, the first one drops at least 10 meters.
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Unfortunately, there was water here today. Without rubber boots, no chance.
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Back again today and walked all the way to the end. There are still rails at the end. Very interesting area.
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After the German armaments factories in Peenemünde on Usedom were severely damaged by the British Operation Hydra, the Nazi government decided to relocate war-critical factories underground. The factories found space primarily in old mines, railway tunnels, or newly constructed galleries. The Rentschen quarry, which had been used for slate mining and closed in 1925, was also designated for the "underground relocation." It was codenamed "Rutte." The Chemnitz-based company Reinecker was supposed to produce armaments on a 3,000-square-meter site. But this never happened. Reinecker found a home in another nearby slate mine. In total, around two dozen underground relocations were occupied or at least planned around Probstzella.
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In the Rentschenbruch near Probstzella, the underground relocation for armaments production was approved under object number 1074, codenamed "Rutte." The Rentschenbruch underground mine had been idle since 1925. A production area of 3,000 square meters was planned for the expansion into an underground armaments factory. A fish name was chosen as the codename, fitting for a mine. The "Rutte" is a critically endangered bony fish from the burbot family and is also called "Trusche" in southern Germany. The Rutte only occurs in freshwater; other names include "Ruppe" or "Aalrutte." But that's just a side note. Originally, the Reinecker company from Chemnitz was supposed to move into the Rentschenbruch slate mine near Probstzella. However, this never happened, so Reinecker was ultimately housed in a bomb-proof slate mine (codenamed Rotfeder) nearby. At times, the Rentschenbruch was also closed for storage purposes by the Wehrmacht. The Geilenberg staff was also interested in the underground cavities of this slate mine. Source: http://www.stollenhausen.de/u-verlagerung-rutte/mobile/
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Also interesting outside opening hours
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The region offers a mix of natural formations and historical mining sites. The Saalfeld Fairy Grottoes are renowned worldwide for their vibrant, colored stalactites formed in a disused mine. For a different kind of adventure, Trailwerk Underground Kamsdorf provides unique underground tours, including mountain biking. Additionally, the Schaubergwerk Morassina, a former alum slate mine, features stunning dripstones and a speleotherapy tunnel.
Yes, several sites are suitable for families. The Saalfeld Fairy Grottoes are very popular, offering a fairy forest and the Grottoneum museum, which children often enjoy. The Schaubergwerk Morassina also has a 'Märchengrotte' (Fairy Tale Grotto) designed for younger visitors. Trailwerk Underground Kamsdorf offers train tours, which can be an exciting experience for families.
The area is rich in mining history. The Schaubergwerk Morassina showcases centuries of alum and vitriol mining, with insights into the mine's state when Alexander von Humboldt researched there in 1792. The Ilsen Cave holds significant archaeological importance as a Stone Age human habitation site. The Rentschenbruch Slate Quarry and the Old Slate Mine Entrance are remnants of the region's extensive slate mining industry, with some sites even repurposed during wartime.
You can observe impressive geological formations, particularly at the Schaubergwerk Morassina, which is famous for its vibrant, colorful dripstones (speleothems) that formed after mining ceased. These formations, made of diadochite, grow rapidly and display unique blue-green, yellow, and fawn tones. The Saalfeld Fairy Grottoes are also celebrated for their distinctively colored stalactites and stalagmites.
Yes, the Ilsen Cave near Remptendorf is a natural cave of significant archaeological importance, having been inhabited by humans over 40,000 years ago. While many other 'caves' in the region are former mines, the Ilsen Cave offers a direct connection to prehistoric human life.
The region around Probstzella is excellent for various outdoor activities. You can find numerous cycling routes, such as those detailed in the Cycling around Probstzella guide, or explore gravel biking trails from the Gravel biking around Probstzella guide. For mountain biking enthusiasts, the MTB Trails around Probstzella guide offers challenging routes, including one that passes near the Saalfeld Fairy Grottoes.
Underground sites generally maintain a consistent temperature year-round, making them suitable for visits in any season. However, to combine your cave exploration with outdoor activities like hiking or cycling, spring, summer, and early autumn offer the most pleasant weather conditions. Always check specific opening hours for each attraction, as they may vary seasonally.
For formal show mines like the Saalfeld Fairy Grottoes or Schaubergwerk Morassina, guided tours ensure safety. If you plan to explore less developed sites like the Old Slate Mine Entrance, it is crucial to wear sturdy shoes and bring good lamps, as access can be affected by water levels and conditions can be challenging. Always prioritize safety and adhere to any posted warnings or restrictions.
The Schieferpark Lehesten is a significant technical monument and nature reserve, showcasing the history of slate mining. While extensive underground tours are no longer possible due to flooding, visitors can explore the 105-hectare park, learn about historical mining practices, and observe the unique ecosystem that has developed in the former quarry. It's an excellent site for those interested in industrial heritage and nature. More information can be found on Wikipedia.
The Devil's Bridge on the Gleitsch is a natural monument featuring impressive rock formations. While not a traditional cave system, it includes natural rock shelters where bones of prehistoric humans were found in the 1970s, indicating historical use. Today, the caves have been filled for safety reasons, but the site remains a popular hiking destination with scenic views.
Yes, the region has sites with wartime significance. The Rentschenbruch Slate Quarry, for example, was designated as an 'underground relocation' facility during World War II for armaments production, though it was never fully utilized for that purpose. These sites offer a glimpse into a lesser-known aspect of the area's history.
For major show mines like the Saalfeld Fairy Grottoes or Schaubergwerk Morassina, guided tours typically last 1 to 1.5 hours. Including time for arrival, exploring visitor centers, and nearby attractions like the fairy forest, you might want to allocate half a day for a comprehensive experience at each. Shorter visits are possible for sites like the Old Slate Mine Entrance or the Ilsen Cave, which might be part of a longer hike.


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