Best caves around Grassau are found within a region characterized by its natural landscapes and proximity to the Chiemgau Alps. While prominent show caves are located further afield, the immediate vicinity offers various natural rock formations and grottoes. The area provides opportunities for outdoor activities amidst its scenic environment.
Last updated: June 26, 2026
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the caves are not signposted anywhere on the trail. However, you can find them easily via komoot. You can enter the small Spielberghöhle for 2 to 3 meters without equipment and cool off a bit 🙂 afterwards it seemed to go steeply down.
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Such places have their own special aura.
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...the Michaels-Klause, also known in the region as Michaels- or Lourdes-Grotte. Michael Schnellinger, born in Feldwies in 1871, is considered the discoverer of this geological formation, which at first glance suggests the entrance to a rock cave (excerpt from: https://www.traunsteiner-tagblatt.de/das-traunsteiner-tagblatt/chiemgau-blaetter/chiemgau-blaetter-2024_ausgabe,-die-michaelsgrotte-fasziniert-seit-120-jahren-_chid,2286.html )
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Invites you to explore... not far from Laubensteingatterl
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Nice viewing rock, but the summit has to be earned (T4+, II)
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I discovered this special place by chance However, the grotto has existed for at least 120 years
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According to legend, three wild girls lived in Hölloch on Engelstein: Williberga, Hatzinga and Angela. They had stretched a rope from one peak to the other, on which they danced and sang. They kept a treasure in an iron chest guarded by a snake, which had the key to the chest in its mouth, and a large black dog with fiery eyes. They also owned a black stallion with a white blaze that grazed in the meadows around Pattenberg at night, and a rooster that the farmers heard crowing during the harvest. The young women were not squeamish and are said to have committed some outrages... So be careful 😉
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The Grassau area features natural rock formations, grottoes, and some more challenging cave systems. While prominent show caves are located further afield in Bavaria, you'll find natural monuments like Engelstein, and grottoes with religious significance such as the Marian Grotto and Forest Chapel.
No, there are no prominent show caves directly within the Grassau municipality. Well-known show caves in Bavaria, like the Teufelshöhle or Sturmannshöhle, are located in regions significantly further afield, such as Franconian Switzerland or Allgäu.
Some locations, like the Marian Grotto and Forest Chapel or Michaelsklause and Lourdes Grotto (Strohnalm), offer a more accessible experience with a focus on natural and religious sites. However, caves like Keyhole Cave and Spielberg Cave are challenging and require experience, fitness, and climbing skills, making them unsuitable for casual family visits.
Access to Engelstein requires walking about 15 minutes. Visitors have noted that parking directly in Pattenberg is not available, so it's recommended to park in areas like Kalkofen or Kohlstatt and walk up the mountain.
The Keyhole Cave is not a show cave. Caving here demands significant experience, fitness, and climbing skills. It is described as tight, cold, wet, and without light. The entrance is at 1274 m altitude, and the cave reaches a depth of 156 m with about 1390 m of corridors.
The Spielberg Cave, like the Keyhole Cave, is not a show cave and requires considerable experience, fitness, and climbing abilities. It is the second largest cave in the Laubensteingebiet, with about 1200 m total length and 180 m depth. The cave has a labyrinthine entrance area and can ice over in winter.
Yes, sites like the Marian Grotto and Forest Chapel and Michaelsklause and Lourdes Grotto (Strohnalm) combine natural grottoes with religious significance, offering a glimpse into local cultural practices and history. The Michaelsklause grotto has been recognized for over 120 years.
The region around Grassau offers various outdoor activities. You can find numerous running trails, including routes like the 'Tyrolean Ache loop' or 'Kendlmühlfilzen Moor – Chapel loop'. There are also many hiking opportunities, such as the 'Staffen mountain forest adventure trail' or 'Hefteralm – Rachlalm loop'. For more details, explore the Running Trails around Grassau or Hiking around Grassau guides.
The natural rock formations and grottoes around Grassau are generally explored independently. For the more challenging cave systems like the Keyhole Cave or Spielberg Cave, formal guided tours are not typically offered, and they require specialized caving experience and equipment.
The best time to visit depends on the specific location. For outdoor grottoes and natural monuments, spring through autumn offers pleasant weather for walking and exploration. For more challenging caves, conditions can vary, with some caves icing over in winter. Always check local conditions and be prepared for cold, wet environments if entering a cave.
Beyond the caves and grottoes, Grassau is known for its picturesque landscape and proximity to natural attractions. The region features beautiful lakes, such as the Taubensee, which is popular for hiking and swimming, and numerous hiking trails through the Chiemgau Alps. You can also find waterfall hikes, like those mentioned in the Waterfall hikes around Grassau guide.
No, the 'Hohler Stein' refers to several distinct locations across Germany, none of which are in or immediately adjacent to Grassau. Notable examples include a prehistoric cave in the Swabian Jura and other natural monuments in different regions.


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