Best caves around Castel Ivano are found in the surrounding Valsugana area, characterized by unique geological formations that have created numerous underground systems. This region offers a diverse range of cave experiences, from challenging speleological sites to accessible tourist attractions. The landscape around Castel Ivano is rich in karstic features, providing a natural environment for various cave types. These geological wonders contribute significantly to the area's natural appeal and offer insights into its ancient history.
Last updated: June 30, 2026
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Very steep section that leads to the top of Ortigara, it is useful to have a headlamp with you
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The tunnel was initially an Austro-Hungarian machine gun emplacement (2093 m), designed to defend the overlooking 2101 m of Mount Ortigara. It was later captured by the Alpine troops during the first attack on June 10, 1917, becoming the headquarters of the Italian command of Colonel Pietro Biancardi, from whom it takes its current name. A must-see on the trail connecting the summit of Mount Ortigara to the Agnella Pass: fascinating, steep, and facilitated by steps and ropes. The imperial emplacements are accessed by descending into a shaft using metal supports (technical descent, only for experts).
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During the First World War, in view of the Battle of Ortigara in 1917, the area on the eastern slopes of Cima Caldiera was transformed into an Italian logistics base of enormous tactical importance: one of the main storage centers for food, ammunition, tools and materials needed for combat and the sustenance of the troops. It was located on the slope sheltered from enemy fire, but close to the front line, to which it was connected by a web of walkways; it was accessible via a wide and comfortable road from Piazzale Lozze, which is now used as a path; the six tunnels dug one after the other, connected internally by a single corridor, served as warehouses and were hidden from view by external wooden barracks that, leaning against the rock, covered the entrances. Two interesting tables show the inventory of the goods stored: food for the soldiers, daily rations and materials for the Engineers.
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The large entrance hall of this cave conceals a deep, dark mouth, filled by an underground stream that is always well-fed, even in dry periods. This is the entrance—reserved for cave divers—to a vast and intricate network of cavities deep within the mountain. The water is actually clear, and it is thought that the name derives from the dark moss-covered floor, over which the stream flows before flowing into the Senaiga. Due to the cave's complex morphology and technical difficulties, exploration began only in the 1970s, and so far, cave divers have discovered a 1,600-meter stretch of siphons and difficult passages. In the 1930s, dye injections proved that this cave communicates with the Castello Tesino Caves, a few kilometers away. Furthermore, an examination of the fine sand found inside, rich in granite crystals, testifies to a significant contribution of water coming from the Cima d'Asta group, much higher and much more distant!
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This large cave has various names: Bus de la Bela, Bus de la Vecia, Bus de la Tosa, Grotta di San Donato, and Grotta dell'Orso. The skeleton of an Ursus Spalaeus (Cave Bear) was found there, a prehistoric animal of imposing size that surpassed that of today's grizzly bear: 3.5 meters (standing) and weighing almost 1 ton. Three explanatory panels at the entrance tell its story. The skeleton is visible free of charge at the Lamon Town Hall. The remains of this mammal have been found in numerous caves across Europe, an environment they used as a dwelling and for hibernation. They often competed with prehistoric humans for ownership of the cave, and one theory suggests they became extinct precisely because of predation by our ancestors. In ancient times, the bones found were attributed to dragons or griffins! Opposite the cave, climbing a short, exposed ramp equipped with a cable leads to a beautiful waterfall. https://it.wikipedia.org/wiki/Ursus_spelaeus
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Karst gorge typical of this type of mountain. There are many throughout the plateau, just look carefully at the maps
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Unpaved stretch, not too demanding, from where you can enjoy very beautiful landscapes and on occasion not very frequented passages
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Yes, the Cave in Castello Tesino is unique in Trentino as it is the only one fully equipped for tourist visits. It offers an accessible and educational experience with well-equipped pathways, making it ideal for the general public and those new to caving. Visits are guided and require advance reservation.
The region offers several caves with significant historical context. The Cima Caldiera Logistics Base Caves (World War I) feature trenches and excavated cavities that served as warehouses for supplies during the Battle of Ortigara. Additionally, the Quota 2093 / Biancardi Gallery WW1 is a tunnel that was an Austro-Hungarian machine gun emplacement, later captured and used by Italian forces.
Yes, the Bus de la Bela is notable for the remains of Ursus spalaeus (Cave Bear) found within. An impressive skeleton is preserved nearby, and the cave itself features strange marks on the walls left by these ancient bears, which coexisted with prehistoric humans.
For experienced cavers, the Grotta dell'acqua nera is a challenging natural monument known for its vast and intricate network of cavities, explored by cave divers. The Cave of Bigonda in Grigno is also highly challenging, with a propensity for sudden flooding, and visits are restricted to expert cavers accompanied by guides from the Gruppo Grotte Selva.
The caves in the Valsugana area, including those near Castel Ivano, are primarily karstic systems. The Busa del Can Sinkhole is a very deep well, classified in the Venetian speleological register, showcasing a significant karstic formation. The Cave in Castello Tesino features intricate arabesques and ancient stalactites and stalagmites formed over millennia.
Yes, guided tours are available for the Cave in Castello Tesino, which is equipped for tourist visits. These tours require advance reservation. For the more challenging Cave of Bigonda, visits are only possible for expert cavers accompanied by guides from the Gruppo Grotte Selva.
The internal temperature of the Cave in Castello Tesino remains consistently around 8 degrees Celsius. It's advisable to wear warm clothing, even in summer, and sturdy, non-slip footwear for safety and comfort in all cave environments.
The area around Castel Ivano offers various outdoor activities. You can explore mountain hikes, including routes like the Cima d'Asta summit loop. There are also numerous running trails and cycling routes, such as the Fontanazzo Biotope loop, providing diverse options for enjoying the natural landscape.
Yes, the Grotta dell'acqua nera has a large entrance hall with a deep, dark mouth filled by an underground stream. This stream is always well-fed, even during dry periods, and is the entrance to a vast network of cavities deep within the mountain.
Yes, the Busa del Can Sinkhole, a very deep well, is located at street level and is not protected in any way. Maximum attention is required, especially if you are with children or animals, as it can be very dangerous.
Caves generally maintain a consistent temperature year-round, making them suitable for visits in most seasons. However, for caves like the Cave of Bigonda, which is prone to sudden flooding, it's crucial to check conditions and guidance from local experts, especially during periods of heavy rainfall or snowmelt. The Cave in Castello Tesino is accessible for guided tours, which can be enjoyed throughout the warmer months.


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