Best caves around Lastebasse offer a unique exploration of natural karst formations and historical military structures. The region, situated in the Italian Prealps, features a landscape shaped by geological processes and historical events. Visitors can discover a variety of natural sinkholes, chasms, and man-made tunnels and fortifications integrated into the rock. These natural features and historical sites provide insights into both the geology and the past of the area.
Last updated: June 30, 2026
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the sinkhole is quite impressive and quite intimidating
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Grandiose work of the engineers of the Great War. It is a daring helical gallery inside a large spire with the aim of rising in altitude. Requires a torch.
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Austro-Hungarian artillery emplacement from World War I, dug into the rock. With the great Spring Offensive of 1916—nicknamed the 'Strafexpedition,' or Punitive Expedition—the Imperial Army aimed to break through the Italian barrier and invade the Po Valley through the valleys of the Vicenza Prealps. Obviously, the first prerequisite for this plan to be feasible was to dominate the surrounding peaks that controlled the access routes below, driving out the enemy. On May 21, 1916, Austro-Hungarian troops passed through an empty and desolate Tonezza: the inhabitants, faced with imminent danger, had quickly abandoned the town and its surrounding countryside to take refuge in the plains, facing exile lasting only a few weeks, but which lasted until the end of the conflict due to the escalation of hostilities. The Italian army, in disadvantaged and indefensible positions, had retreated, barricading itself on Mount Cimone, the last and indispensable bastion of resistance. To defend and maintain the positions they had conquered on the Tonezza Plateau, the Austro-Hungarian units built trenches, walkways, cave shelters, and artillery emplacements everywhere, like this fort: dug into a natural rock formation, it housed a 105 mm gun to dominate the Rio Freddo Valley below. The trees, now dense, were gone over a hundred years ago, having been felled by soldiers who needed a clear line of sight. Not far away, continuing along the steep path that descends to the valley toward the climbing wall, there is a second fort, dug into a cave, which housed another 105 mm gun.
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A foaming and thunderous waterfall cascades from the spring known as 'Gorgo Santo' (which can be visited a little further along, climbing the trail —> see related highlight). The small bridge actually spans two waterfalls, one upstream and one downstream. I recommend descending to the paved road below, on the border between the hamlets of Scalzeri and Longhi, for a spectacular view of the stream cascading through a series of rapid drops before flowing into the Astico River. I also recommend visiting this site after days of rain or when the snow has melted in the mountains, to see the water swollen and rushing!
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The diameter and depth of the chasm are impressive. It's scary. I advise caution in the cold months (and not only) as there is ice everywhere and the area becomes a skating rink, although there are protective barriers. I speak from lived experience....
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Natural chasm that nature is now recovering, worth seeing if you pass through the area
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The Gorgo Santo is a spring that features a very rare phenomenon... Rainwater and snow water are not retained by the Luserna Plateau due to the karst composition of the terrain; instead, it flows down the valley through tortuous underground passages. Under normal conditions, it flows from the lower Gorgo Santo cave; however, in heavy rain or snow, the cave may be unable to handle the full flow, so the water is also released from the upper Gorgo Santo cave... a sort of safety valve. Pope Boniface IV (7th century) happened to pass through these parts during a trip and blessed the whirlpool: hence the name "santo." But there is another, more evocative and legendary, theory behind the name: it is said that here, Saint George defeated the Great Dragon that dwelt in the cave and dominated the valley! The presence or absence of water depends on rainfall or snowfall: to find a good flow of water, you should visit on days after it has rained; otherwise, you'll visit the whirlpool in its "dry" state.
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An Italian frontline stronghold during the Great War, with an impressive tunnel that spiraled up the rock tower, allowing soldiers to negotiate the height difference, protected from enemy fire and sight, and approach the foot of Mount Cimone to recapture it. This bastion, which has no place name on war maps, was called "Quota Neutra" by the Italians because it was located in "no man's land" between the lines of the two opposing forces: the Austro-Hungarians on Mount Cimone and the Italians on Mount Caviojo. It's pitch black and has a steep staircase, with steps often made slippery by the damp, but a rope helps: a flashlight is essential.
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The area around Lastebasse offers a unique combination of natural karst formations, such as sinkholes and chasms, and historical military structures integrated into the rock. You'll find both geological wonders and man-made tunnels and fortifications from World War I.
One of the most impressive natural features is the Siesòn Cave (or Sciasòn Chasm), a spectacular karst sinkhole descending 96 meters. Another significant natural chasm is the Stonhaus Sinkhole, formed by a collapsed cave roof, featuring a natural stone arch and a depth of at least 30 meters.
Yes, the region is rich in historical military sites built into natural rock formations. You can visit the Campiglia Gun Emplacement, a WWI fortification offering panoramic views, and the Neutral Elevation Tunnel (Cimone), a daring helical gallery used as an Italian frontline stronghold during the Great War. Another example is The WWI Fort, an Austro-Hungarian artillery emplacement dug into the rock.
The difficulty varies. Natural chasms like Siesòn Cave and historical tunnels like the Neutral Elevation Tunnel are considered challenging due to steep descents, potential ice, or dark, slippery conditions requiring a torch. Other sites, such as the Stonhaus Sinkhole and the military emplacements, are generally intermediate, but caution is always advised.
For sites like the Neutral Elevation Tunnel, a flashlight or headlamp is essential as it's pitch black inside. Given the potential for ice and slippery surfaces, especially in colder months, sturdy footwear with good grip is highly recommended. Layers of clothing are also advisable due to temperature changes inside and outside the formations.
While many of the deeper natural chasms and historical tunnels can be challenging, some areas around the sinkholes, like the Stonhaus Sinkhole, offer more accessible viewpoints. Always check the specific trail conditions and difficulty before bringing children, as some paths can be steep or slippery.
The Lastebasse area is excellent for various outdoor activities. You can find numerous mountain hikes, cycling routes, and MTB trails that often pass near or lead to these natural and historical sites. These routes offer opportunities to explore the beautiful Prealps landscape.
The terrain can be varied, ranging from forest paths to rocky, steep ascents and descents, especially when approaching sinkholes or historical tunnels. Some areas may have protective barriers, but others might be more rugged. Always be prepared for uneven surfaces and potential exposure to the elements.
Based on available information, Lastebasse is not primarily known for large, commercially developed show caves like those found in other parts of Italy. Instead, the region features a collection of significant natural karst sinkholes, chasms, and historical military structures that utilize natural rock formations, offering a different kind of exploration experience.
Visitors often appreciate the impressive and spectacular nature of the sinkholes, such as the Siesòn Cave, and the unique historical insights offered by the WWI military structures like the Campiglia Gun Emplacement. The blend of natural beauty and historical significance makes for a compelling visit, with many users sharing photos and upvoting these unique spots.
Yes, the Stonhaus Sinkhole, which means 'House of Stone' in the Cimbrian language, is associated with a local legend. It's said to be the home of a solitary ogre who takes naughty children there until they repent, a tale used to encourage good behavior.


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