Best caves around Sarmede are located in a region characterized by its karst topography and rich geological history, particularly in the nearby province of Treviso. This area features a unique blend of natural formations and historical human activity, shaped by water erosion and ancient quarrying. The landscape includes deep gorges, waterfalls, and various cave systems, offering insights into both natural processes and local heritage.
Last updated: October 3, 2026
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Its history intertwines nature, folklore, and wartime events: 1. The formation and legend of "will-o'-the-wisps" The name Bus de la Lum derives from a mysterious phenomenon that for centuries fueled legends and popular tales. The folklore: Shepherds and locals told of strange little flames or bluish glows that danced above the cave entrance during summer nights. Popular belief attributed these lights to the presence of witches (eàne or anguane) or restless spirits. The scientific explanation: In reality, the cave had been used since time immemorial to dispose of the carcasses of animals that died on the plateau's farms. The decomposition of organic matter generated methane and hydrogen phosphide gases which, upon contact with air, produced small and harmless will-o'-the-wisps. 2. The events of the Second World War Between 1943 and 1945, the Cansiglio Plain was a strategic stronghold of the Italian Resistance, garrisoned by partisans of the "Garibaldi" Brigade (and other local formations) against the Nazi-Fascist occupying forces. During the harshest phases of the conflict and in the dramatic months of roundups and executions at the end of the war, the Bus de la Lum was used as a natural mass grave. The bodies of German soldiers, fascists, and Republicans captured in combat or roundups, as well as civilians accused of collaborationism or espionage, were thrown into the chasm. In the post-war period, amidst explorations and speleological recoveries, the cavity was the subject of heated historiographical and political debates regarding the precise number and identities of the people who fell into the well. 3. The site today Today the Bus de la Lum is recognized as a place of memory. The entrance to the abyss is protected and fenced for safety reasons, flanked by a large metal cross and a plaque in memory of all the nameless fallen.
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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 region around Sarmede offers a mix of natural and man-made cave systems. Key attractions include Gorgazzo Spring, where the Livenza river originates with stunning green water, and the unique Caglieron Caves, which feature both natural gorges and historical sandstone quarries. Another significant site is the Bus de la Lum Sinkhole, a karst formation with historical significance.
The Caglieron Caves are unique for their blend of natural beauty and historical human activity. They feature a deep gorge carved by the Caglieron stream with numerous waterfalls, alongside artificial caves created from the 16th century by extracting 'pietra dolza' (soft sandstone). Visitors can see distinctive 45-degree inclined columns left as supports from this mining technique. One cave, the Grotta di San Lucio, is even used for aging local cheese.
Yes, the Caglieron Caves are generally considered family-friendly. They are made accessible by sturdy wooden walkways that guide visitors through the gorge and various cavities, offering close-up views of waterfalls and geological formations. The walk is relatively short, typically taking 45 minutes to an hour, making it suitable for most ages.
Many caves in the region have historical importance. The Caglieron Caves showcase centuries of sandstone extraction, visible in the artificial cavities and supporting columns. The Bus de la Lum Sinkhole is notable for its historical legends and its use as an improvised burial ground during World War II. Additionally, the Grotta dei Pilastrini also represents ancient sandstone quarries, similar to Caglieron.
At the Caglieron Caves, you'll encounter a deep gorge carved by the Caglieron stream, featuring numerous waterfalls, some several meters high, and distinctive potholes. The torrent flows over layers of calcareous conglomerate, sandstone, and marl, creating a scenic and refreshing environment with lush vegetation.
The caves, particularly the Caglieron Caves, offer different experiences depending on the season. In summer, the environment is refreshing due to the flowing water and shade. In winter, the waterfalls can freeze, creating a stunning icy spectacle. Non-slip shoes are recommended year-round due to potentially slippery areas.
Yes, the region offers various hiking opportunities. For instance, you can find moderate hiking trails like the Pagnoca Trail or explore the Cansiglio Forest loop. You can discover more options and detailed routes on the Hiking around Sarmede guide.
Beyond exploring caves, the area around Sarmede is excellent for cycling. You can find numerous routes for both road cycling and touring. Explore options like the Meschio River loop for road cycling or the Ring on the Cansiglio plain for touring. Detailed routes are available in the Road Cycling Routes around Sarmede and Cycling around Sarmede guides.
Yes, the Grotto of Our Lady of Agnelezza is a suggestive corner for meditation and prayer. It features a small natural cave with a figurine of the Madonna and an altar, located along a steep hiking path leading to Mount Pizzoc. Masses are celebrated there twice a year, at the opening and closing of the hiking season.
When visiting the caves, especially those with natural water features like the Caglieron Caves, it's highly recommended to wear non-slip shoes. The wooden walkways and natural paths can be wet and slippery, particularly near waterfalls or during damp weather.
Yes, the Caglieron Caves offer a unique local delicacy. The Grotta di San Lucio within the complex is used for aging the Agricansiglio 'Grotte del Caglieron' cheese, providing a distinctive microclimate that enhances its flavor. Visitors often have the opportunity to taste and purchase this cheese.
The Caglieron Caves are made accessible by sturdy wooden walkways that guide visitors through the gorge and various cavities. While generally well-maintained and suitable for most, some areas can be slippery, so appropriate footwear is advised. The walk is relatively short, making it manageable for a wide range of visitors.


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