Best natural monuments around Sankt Thomas offer a diverse landscape, characterized by volcanic formations and unique geological features. The region features a variety of natural attractions, including maars, ice caves, and geysers. These sites provide opportunities to observe distinct ecosystems and geological processes.
Last updated: April 26, 2026
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Beautiful view over the Eifel heights
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Brubble approx. every 40 min
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The Geyser in Wallenborn is a cold water geyser that erupts every 35 minutes. So if you just missed the eruption (or want to see it again), you only have to wait half an hour and the spectacle begins again. The physical basics around the geyser are sufficiently explained on the display boards all around. The Wallende Born is something like the smaller brother of the cold water geyser in Andernach, because the physical principle is the same. In the past, you could visit the geyser free of charge, but today you have to pay a small fee, which is manageable, and if you haven't seen something like this before, you should take a look (it's always cheaper than the Andernach geyser).
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Here you have a very nice view of the Maar.
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The enchanting Meerfelder Maar lies in the middle of the largest Maar funnel in the Eifel. This maar is at least 30,000 years old and takes up about half the space of the maar funnel. The idyllic village of Meerfeld nestles against the steep southern slopes of the other half.
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On to the "Brubbel": https://www.eifel.info/a-wallender-born
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The cold water geyser, which is actually a drilled mofette, shoots up a water fountain every 35 minutes. Interesting. A visit to this geyser can easily be combined with the HeimatSspur hiking trail "Wallenborner Weg".
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A very nice section above Von Meerfeld and Deudesfeld.
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Sankt Thomas is known for its diverse geological formations, including maars, ice caves, and a cold-water geyser. You can visit the Meerfelder Maar, a volcanic lake, or explore the fascinating Birresborn Ice Caves, which maintain low temperatures even in summer. Don't miss the Wallender Born Geyser, a unique cold-water geyser with predictable eruptions.
Yes, several natural monuments are suitable for families. The Meerfelder Maar offers a scenic lake environment for walks and even swimming (with prior reservation). The Landesblick Observation Tower provides rewarding views after a moderate ascent, and the Wallender Born Geyser is a captivating sight for all ages with its regular eruptions.
For panoramic views, the Landesblick Observation Tower at Meerfelder Maar is highly recommended. From its twelve-meter-high wooden structure, you get a breathtaking 360-degree view over Meerfeld, the maar, and the surrounding landscape. The ascent is tough but well worth the effort for the vista.
The Birresborn Ice Caves were originally formed through millstone mining, not naturally, and have been a listed building since 1938. They maintain a consistent temperature between -1°C and +4°C, allowing icicles and columns to persist into summer. These caves also serve as crucial winter quarters for bats, so they are closed from October to March to protect the hibernating animals. Remember to bring a flashlight and wear sturdy shoes if you plan to explore them.
Yes, you can enjoy a refreshing swim in the Meerfelder Maar. However, during certain times, a prior reservation might be required. It's always a good idea to check local regulations before your visit.
Absolutely! The region offers numerous hiking trails. For example, you can find routes like the 'View of St. Thomas – Kyllburg Marian Column loop' or the 'Heilenbach Stream – Neidenbach Waterfall loop' starting from St. Thomas. You can explore more options and detailed routes in the Hiking around Sankt Thomas guide.
Visitors particularly appreciate the unique geological formations, such as the volcanic Meerfelder Maar and the cold-water Wallender Born Geyser. The stunning views from the Landesblick Observation Tower are also a highlight, as are the historical and cool Birresborn Ice Caves. The komoot community has shared over 530 photos and given more than 580 upvotes, reflecting a strong appreciation for the area's natural beauty and unique attractions.
Yes, the Mariengrotte Albach Waterfall is a notable natural monument in the region. It features a small waterfall alongside a grotto adorned by believers, making it a destination for pilgrims and a tranquil spot in the idyllic Albach valley.
The Birresborn Ice Caves are best visited between April and September. They are closed from October 1st to March 31st to protect bats during their hibernation period, in accordance with nature conservation laws.
Yes, Sankt Thomas offers various cycling opportunities. You can find both mountain biking and road cycling routes in the vicinity. For detailed options, check out the MTB Trails around Sankt Thomas guide and the Road Cycling Routes around Sankt Thomas guide.


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