Caves around Ospedaletto, located in Italy's Trentino region, offer a diverse range of underground formations. The broader Valsugana and Lagorai area is known for its speleological features, including karst cavities shaped by water over centuries. These geological formations present opportunities to explore natural beauty and historical significance. The region features both natural caves and historical sites within cave systems.
Last updated: August 23, 2026
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Cave discovered in 1927, named in the local dialect Bus de la Lora, it is explored for about 450 meters. It was a refuge for the cave bear according to studies carried out.
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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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Discovered in the early twentieth century and studied throughout the century, the so-called Castello Tesino cave is located at an altitude of 960 metres. It is the only cave in Trentino equipped for tourist visits and stands on the right bank of the Senaiga stream. A karst cavity characterized by tunnels, arabesques, stalactites and stalagmites formed over the millennia, it offers a wonderful experience to those wishing to take part in the guided tours, which normally run from April to October.
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The caves in the Valsugana and Lagorai area, including those near Ospedaletto, are primarily karst cavities. These are shaped by water over centuries, creating spectacular formations like stalactites and stalagmites. You can also find unique features such as submerged lakes and extensive networks of galleries, as seen in the Grotta della Bigonda, or deep karst gorges like the Busa del Can Sinkhole.
Yes, the region has significant historical cave sites. For instance, the Quota 2093 / Biancardi Gallery WW1 is a tunnel that served as an Austro-Hungarian machine gun emplacement and later as an Italian command headquarters during World War I. Another example is the Cima Caldiera Logistics Base Caves (World War I), which were used as storage centers for supplies during the Battle of Ortigara.
Yes, some caves in the broader Trentino region hold archaeological importance. For example, the Bus de la Bela cave is known for the discovery of Ursus spelaeus (Cave Bear) remains, a large mammal from the middle and late Pleistocene era. These findings offer insights into prehistoric life in the area.
Many caves in the Trentino region, including some around Ospedaletto, are only accessible to experienced speleologists and often require a guide due to challenging conditions and potential for sudden flooding. The Grotta dell'acqua nera, for instance, is reserved for cave divers due to its complex, submerged network. However, some historical sites within cave systems might be more accessible for general visitors.
For complex and challenging cave systems like the Grotta della Bigonda, access is typically restricted to experienced speleologists, often guided by local speleological groups. It's advisable to check with local authorities or speleological associations for specific permit requirements and guided tour availability for any cave you plan to explore.
The Ospedaletto area offers various outdoor activities. You can find numerous hiking trails, such as the moderate Monte Ortigara Trail or the Cima Caldiera Historical Trail. For cycling enthusiasts, there are road cycling routes like the Castelnovo Bike Grill – Valsugana Cycle Path loop, and gravel biking options including the Five Crosses Pass – Passo Brocon loop. You can explore these and more on the Hiking around Ospedaletto, Road Cycling Routes around Ospedaletto, and Gravel biking around Ospedaletto guide pages.
Yes, the region around Ospedaletto offers many hiking opportunities. Trails like the Monte Ortigara Trail and the Cima Caldiera Historical Trail are popular and can be combined with visits to nearby historical cave sites. For more details on hiking routes, refer to the Hiking around Ospedaletto guide.
The best time to visit depends on the specific cave and your activity. While some caves might be accessible year-round, conditions can vary. Caves with submerged sections, like the Grotta della Bigonda, are susceptible to sudden flooding, making exploration challenging, especially during periods of heavy rainfall or snowmelt. For general outdoor activities in the Valsugana and Lagorai area, spring to early autumn typically offers the most favorable weather.
For any cave exploration, especially in challenging systems, appropriate gear is crucial. This typically includes sturdy footwear with good grip, protective clothing (layers are recommended as cave temperatures are constant and often cool), a helmet, and a reliable headlamp with spare batteries. For expert-level caving, specialized equipment like wetsuits (for submerged sections) and climbing gear may be necessary.
While many of the more extensive cave systems in the Trentino region are for experts, some historical sites or less demanding natural formations might offer easier access. For example, the entrance to the Busa del Can Sinkhole is at street level, though caution is advised due to its depth. Always check specific accessibility details for each site, as conditions can vary.
The caves in this area are primarily karst formations, resulting from the dissolution of soluble bedrock like limestone by groundwater. This process creates intricate networks of passages, chambers, stalactites, stalagmites, and sometimes underground rivers and lakes. The Grotta dell'acqua nera, for instance, features a vast and intricate network of cavities deep within the mountain, fed by an underground stream.


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