Best caves around Fregona are found in a region characterized by its diverse geological formations, including deep gorges, natural springs, and karst landscapes. This area, nestled near the Cansiglio-Cavallo group, features a unique blend of natural caves and historical human interventions. The presence of the Caglieron stream has sculpted impressive waterfalls and rock formations over time. Fregona offers a compelling destination for those interested in geology, history, and outdoor exploration.
Last updated: October 3, 2026
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The Cansiglio Forest hides a myriad of sinkholes, pits, and swallow holes of all sizes, due to the karst morphology of the territory: the rain dissolves the limestone rock, slowly but inexorably forming these natural chasms and fissures on the ground. The Bus de la Lum is an abyss characterized by a single large vertical entrance shaft 180m high, which then develops into a very large and articulated underground complex. The depth of the shaft is best appreciated out of season, because in summer the lush vegetation tends to partially obscure the view. According to ancient beliefs, it is the dwelling of the Anguane or Anduane, fierce and evil witches, toothless, with long rusty nails instead of hair and sharp fangs, who kidnapped and ate children! They gathered at the bottom of the cave, lighting fires, whose glows rose to the surface, visible at night to the shepherds of the area: hence the name 'Buco della Luce' (Hole of Light). In reality, the legend has a grain of truth: on hot summer nights, will-o'-the-wisps could indeed be formed by the decomposing carcasses of livestock dead from illness, which it was customary to throw into the Buso. During World War II, the cavity was sadly used by partisans as a foiba, to dispose of the bodies of fascists and nazis, but also of civilians: over the years, several bodies and bones have been found during explorations. https://it.wikipedia.org/wiki/Bus_de_la_Lum
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The Gorgazzo springs have the characteristic of collecting rainwater which, infiltrating the karst structure of the Cansiglio plateau, emerges at the base of the mountain with an already considerable flow rate.
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A magical place, with an incredible scientific history. Always worth a stop.
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The name probably derives from "lume" or flame, due to the luminescence that would have been seen on summer nights above the cavity, produced by the gases generated by the putrefaction of animal carcasses thrown into the well. The cavity was formed by karst, or by the dissolution of the rock by water. According to legend, it is inhabited by the Anguane, very ugly fairies, with nails instead of hair, and long fangs instead of teeth. During the day they went to wash clothes at Lake Santa Croce, then wandered around in search of wood, food and children to roast. At night, they lit a small fire, whose light, spotted by shepherds, gives the cavity its name
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The Caglieron caves are located in the municipality of Fregona, province of Treviso, precisely in the locality of Breda. It is a series of cavities created partly by natural erosion and partly by human action.
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Directions for visiting the Caglieron Caves. https://www.prolocofregona.it/grotte-del-caglieron/
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The Gorgazzo spring is an underwater cave from which the homonymous stream, a tributary of the Livenza river, originates. Located near Polcenigo, its name derives from the Friulian 'gorc' which means abyss. The cave consists of a resurgence and near the entrance of the cavity, at a depth of nine meters, a statue of Christ has been placed, which, thanks to the clarity of the water and the bottom, is visible from the outside from the shore on sunny days.
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The Fregona region features a distinctive blend of natural caves, sculpted by water and geological processes, and artificial cavities created by historical human activity. You'll find deep gorges, natural springs, and karst landscapes, alongside ancient sandstone quarries where stone was extracted for local buildings. This combination offers a rich experience of both natural beauty and historical significance.
Yes, the Caglieron Caves are considered family-friendly. A well-developed circular trail, about 1.5 kilometers long, guides visitors safely through the landscape with wooden walkways and bridges. It's an ideal excursion for families, offering an engaging mix of nature and history.
The caves around Fregona hold significant historical value. For instance, the Caglieron Caves include artificial cavities from 16th-century sandstone quarrying, where you can still see chisel marks and inclined pillars left by stonemasons. Similarly, the Grotta dei Pilastrini showcases ancient extraction methods. The Bus de la Lum Sinkhole is also steeped in local legends and historical accounts, including events from World War II.
The circular trail through the Caglieron Caves is approximately 1.5 kilometers long. While not very long, it offers numerous photo opportunities and insights into the geology and history, so visitors typically spend 1 to 2 hours exploring at a comfortable pace.
Sturdy footwear is highly recommended for visiting the caves, especially the Caglieron Caves, as paths can be slippery in places due to the waterfalls and humidity. The cool, humid air inside the caves provides refreshment on hot days, but a light jacket might be comfortable during cooler months.
Yes, the region is known for its impressive water features. The Gorgazzo Spring is a beautiful natural monument where the Livenza river originates, featuring water with a fabulous green hue. The Caglieron Caves also boast spectacular waterfalls that plunge into the depths, and can even freeze over in colder months.
Beyond cave exploration, Fregona offers a variety of outdoor activities. You can find numerous routes for mountain biking, such as the 'Candaglia Forest Road – Pian del Cansiglio loop', or challenging mountain hikes like the 'Col del Gài loop'. There are also running trails available, including the 'Monte Pizzoc — ring tour'. For more details, explore the MTB Trails around Fregona, Mountain Hikes around Fregona, and Running Trails around Fregona guides.
Yes, parking is available near the Grotte del Caglieron. While entry to the caves is free, there might be a parking fee.
The caves offer different experiences depending on the season. During warmer months, the cool, humid air inside the caves provides a welcome refreshment. In colder months, the waterfalls at the Caglieron Caves can freeze, creating a stunning winter wonderland scene. The caves are generally accessible from sunrise to sunset year-round.
Yes, within the broader Grotte del Caglieron complex, you can find several unique features. These include the Grotta dei Breda, a large cave with huge stone pillars, and the Grotta di San Lucio (also known as Grotta del Formaggio), which is actively used for ripening cheese. There's also the Grotta della Madonna, a small chapel nestled in a tiny cave, and the Grotta di Santa Barbara, once used for mushroom cultivation.
The Bus de la Lum Sinkhole is a natural monument formed by karst dissolution. It is steeped in local legends, with its name possibly deriving from the luminescence seen above the cavity. It also holds historical significance, having been the scene of tragic events during World War II, making it a site of both natural wonder and historical reflection.
Yes, the Grotto of Our Lady of Agnelezza offers a suggestive corner for meditation and prayer. This small natural cave, featuring a figurine of the Madonna and an altar, is found along a steep hiking path leading to Mount Pizzoc, providing a serene and reflective spot amidst the dense forest.


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