Top 9 Caves around Achau
Best caves around Achau are found in a region of Lower Austria known for its subterranean formations. Achau is a municipality situated near the district of Mödling, offering access to distinct underground experiences. The area features natural rock formations and historical mining sites that have been transformed into accessible attractions. This landscape provides opportunities for exploring unique geological features and historical sites.
Best caves around Achau
- The most popular caves is Seegrotte Hinterbrühl – Europe's Largest Underground Lake, a lake and historical site that is a disused gypsum mine. This site is notable for being Europe's largest underground lake, offering boat tours through its tunnels.
- Another must-see spot is Frauenstein Cave, a small grotto. Visitors can expect a natural alcove that serves as a resting place for hikers on the Frauenstein, accessible via a hiking trail.
- Visitors also love Matterhörndl, a natural monument with a small opening. This 10-meter-high limestone rock is considered a mystical place for its unique formation and offers a spot for a short rest.
- Achau is known for natural rock formations, historical mining caves, and small grottoes. The variety of caves to see and explore ranges from expansive underground lakes to smaller, accessible grottoes and rock shelters.
- The caves around Achau are appreciated by the komoot community, with more than 400 upvotes and over 160 photos shared by users.
Last updated: May 19, 2026
Matterhörndl
Highlight • Natural Monument
Translated by Google •
Tip by
Seegrotte Hinterbrühl – Europe's Largest Underground Lake
Highlight • Lake
Translated by Google •
Tip by
Sign up now to discover places like this
Get recommendations on the best single tracks, peaks, & plenty of other exciting outdoor places.
Sign up for free
Siebenbrunnengraben Trail
Highlight • Trail
Overall a speedy flow trail, probably not very common, be careful at the end because the passage is blocked.
Enjoy!
Tip by
Frauenstein Cave
Highlight • Cave
Translated by Google •
Tip by
Dreidärrischen Cave
Highlight • Cave
Showing Translation
Tip by
Sign up for free to discover even more caves around Achau.
Sign up for free
Already have an account?
Start today with a free account
Your next adventure awaits.
Login or Signup
Tips from the Community
First, you walk through a low tunnel far into the mountain, where you are finally given a detailed explanation of the working conditions in former times and what happened in the tunnel during the Second World War, including the construction of the first fighter jet. After the mine tour, you continue a bit further down to the largest underground lake in Europe, where you take a short boat trip. The lake is very clear, the air is great, and the lighting is also very beautiful to look at. We went to the Seegrotte purely by chance and were lucky enough to get a private tour, as apparently no one else wanted to visit the grotto at lunchtime. Our guide was very nice, explained everything in great detail, and in the end, we were even allowed to do two laps on the lake.
0
0
There was also a collapse long before 1980. Since then, the cave has been considered prone to collapse. Many rock debris lie in the artificially created entrance tunnel.
1
0
Leiwander Trail is slippery when wet. Sometimes blocked by trees.
0
0
The Matterhörndl is a small but impressive rock in the Vienna Woods that is perfect for a short rest. It is a little hidden away from the main path and easy to miss, but it is worth the visit. With a small opening through and the opportunity to climb around a bit, it is a mystical place for photographers, children and nature lovers. I visited this mountain as part of my Dwarf Mountain Tours series. My goal is to climb every mountain in the Vienna Woods. Find my tours here: https://www.komoot.com/de-de/collection/2517195/-zwergbergtouren-im-wienerwald
7
1
The Seegrotte Hinterbrühl is a former gypsum mine near Vienna that has become a show mine and a popular attraction. The Seegrotte has an eventful history, ranging from mining to the Second World War to a film set. The main attraction is the largest underground lake in Europe, where you can take a romantic boat trip. The sea grotto is open all year round and is a unique experience whatever the weather.
2
1
The Frauenstein Cave in Mödling is a small grotto located on the Frauenstein. The Frauenstein is a rocky outcrop with a summit cross, which is the symbol of Mödling. The cross has been damaged and repaired several times. The Frauenstein Cave can only be reached via a hiking trail that starts from the Black Tower. The cave is not very big and has no special geological features. It is more of a hiding place for hikers who want to take a break.
5
0
Is an experience the grotto
2
0
The Seegrotte is definitely worth a visit!👍
2
0
Frequently Asked Questions
What are the most popular caves to visit near Achau?
The most popular cave is the Seegrotte Hinterbrühl – Europe's Largest Underground Lake, known for its boat tours through a former gypsum mine. Another well-liked spot is the Matterhörndl, a unique limestone rock formation that offers a mystical resting place.
Are there any family-friendly caves or activities near Achau?
Yes, the Seegrotte Hinterbrühl is an ideal excursion for all ages, offering boat trips across Europe's largest underground lake. The Matterhörndl is also considered family-friendly, providing a unique rock formation for children and nature lovers to explore.
What kind of natural features can I expect to see in the caves around Achau?
The region offers a variety of natural features. The Seegrotte Hinterbrühl features Europe's largest underground lake within a former gypsum mine. The Frauenstein Cave is a small natural grotto, while the Matterhörndl is a distinctive 10-meter-high limestone rock with a small opening.
Are there historical sites associated with the caves near Achau?
Yes, the Seegrotte Hinterbrühl has significant historical context. It was originally a gypsum mine and later served as a hidden aircraft production facility during World War II, adding a layer of intrigue to its natural beauty.
When is the best time to visit the caves around Achau?
The Seegrotte Hinterbrühl maintains a consistent year-round temperature of 9°C, making it a suitable destination regardless of the outside weather. For caves accessible via hiking trails, like the Frauenstein Cave, spring and autumn offer pleasant hiking conditions.
Are there hiking trails that lead to or past caves near Achau?
Yes, the Frauenstein Cave is accessible via a hiking trail starting from the Black Tower in Mödling. Additionally, the Siebenbrunnengraben Trail is a downhill route that leads past the Dreidärrhöhle cave. You can find more hiking options in the Mountain Hikes around Achau guide.
What other outdoor activities can I do near the caves around Achau?
Beyond cave exploration, the area around Achau offers various outdoor activities. You can find routes for gravel biking, mountain hikes, and road cycling. There's also a Cave and Bouldering Area for climbing enthusiasts.
Is bouldering available near the caves?
Yes, there is a dedicated Cave and Bouldering Area. It features a small cave and a climbing garden equipped with steel cables and mats, serving as a shelter for climbers.
Are there any caves that offer a quiet resting spot for hikers?
The Frauenstein Cave is a small grotto specifically noted as a simple resting place for hikers on the Frauenstein. The Matterhörndl also provides a spot for a short rest amidst scenic surroundings.
What do visitors enjoy most about the caves around Achau?
Visitors appreciate the unique experiences offered, from the serene boat tours on Europe's largest underground lake at Seegrotte Hinterbrühl to the mystical atmosphere and photo opportunities at the Matterhörndl. The blend of nature, history, and adventure is a common highlight.
Are there any caves that are part of a longer trail or route?
Yes, the Siebenbrunnengraben Trail is a flowy downhill trail that passes by the Dreidärrhöhle cave, offering a varied experience with stones, roots, and trees.
Most popular routes around Achau
Most popular attractions around Achau
Get inspired with the komoot mobile app
Explore more
Extend your search for the best caves by checking out these guides of the top ones around Achau:
