Caves of the Sibillini Mountains

Caves of the Sibillini Mountains: the map

The caves are all on the Marche side of the massif, in three separate areas.

• Montemonaco (Monte Sibilla). The Grotta della Sibilla opens near the summit of Monte Sibilla, which reaches 2,173 m, in the upper Aso valley. Montemonaco is a medieval village at 988 m, below the mountain.
• Fiastra and Cessapalombo (Fiastrone valley). The Grotta dei Frati lies in the territory of Fiastra but is easily reached from Cessapalombo. It sits on the southern slope of Monte Fiegni, on a rock face overlooking the Gole del Fiastrone.
• Bolognola. This is where the two Grotte dell'Orso are, in parallel valleys. One is near the Cascata dell'Acquasanta, the other in the Vallata del Fargno, on the Costa delle Vetiche.

The three areas are linked by mountain roads. It makes sense to plan the visit by area, pairing each cave with nearby sights, such as Lago di Fiastra and the Lame Rosse, or the Valle dell'Acquasanta.

Caves of the Sibillini Mountains: the top places

Grotta della Sibilla (Montemonaco). The Grotta della Sibilla is the most famous and, at the same time, the least visitable. Today it cannot be entered. The entrance is blocked: a landslide deposit has covered it since the 1930s and since the 1960s it has been completely sealed. The many attempts to force it open with explosives during the 20th century contributed to the collapse. The remains of the cave and the summit of Monte Sibilla can be reached, but not the interior.

The appeal of the place comes from the legend of the Apennine Sibyl. According to tradition, the cave was the entrance to the underground kingdom of a woman with prophetic powers, described at times as a sorceress and enchantress, at times as a demonic creature. Inside the cave, a narrow passage was said to lead to two huge metal doors that banged menacingly. According to another local tradition, the Sibyl was instead a good fairy, and her handmaidens came down to the valley to teach spinning and weaving or to dance with young people at festivals.

The cave has been told in literature. In the chivalric romance Il Guerin Meschino by Andrea da Barberino, the hero searches for his parents and reaches the cave, where he resists temptation for a year. The French knight Antoine de La Sale, who reached the cave in May 1420, described it in Le Paradis de la Reine Sibylle, also collecting the stories of the people of Montemonaco. Tradition has it that on his journey he went only as far as a square chamber cut into the rock, just beyond the narrow opening.

The most described hike starts from the Rifugio Sibilla, a mountain hut at 1,540 m. The Park rates it EE (for experienced hikers): it is an 11.8 km loop with 710 m of elevation gain and takes about 4 hours and 10 minutes of walking. It climbs CAI trail 155 along the southwest ridge to the "Corona", a band of rock fitted with chains. Just beyond are the remains of the cave and, farther on, the summit. The descent follows CAI trail 156 along the western ridge, down to the dirt road near the hut. The full itinerary is on the page Grotta della Sibilla: how to get there and trails.

In Montemonaco, at Villa Curi, is the Sibyl's Cave Museum, currently closed for restoration. It holds artistic, historical and cultural material from the municipality, including old books and parchments linked to the legend. It is a useful stop to understand the story before climbing, or as a consolation if the cave stays out of reach.

Grotta dei Frati (Fiastra and Cessapalombo). The Grotta dei Frati is a hermitage carved into the rock, in the valley of the Fiastrone stream. It is actually a complex of three karst caves. According to tradition, it was a refuge for Benedictine monks around the year 1000. In 1234 a convent with a chapel was built there, housing up to 16 friars. The convent remained active until the early 1600s and also served for defense. The name recalls the presence first of the Benedictines and then of the Franciscans.

Inside the cave is a chapel with a cross vault dedicated to Santa Maria Maddalena de Specu. The remains of the walls, a stone altar, the stairs to the upper floor and the cistern for collecting water are also still visible.

The simplest route starts from Villa, in the municipality of Cessapalombo. Follow a cobbled road for about 800 m, cross a bridge and continue on a gravel road for 3.5 km, to a parking area where the car is left. From there you continue on foot, through the woods. The difficulty is easy: it is about 5 km from Villa, with about 90 minutes out and the same back. Along the trail there are two branches, one toward the stream and the gorge, the other toward the Lame Rosse. The valley is covered with Mediterranean scrub, hornbeams, oaks and holm oaks, with beeches higher up. The Lame Rosse are pinnacles and towers of gravel, clay and silt, shaped by erosion.

For a longer hike, start from the dam of Lago di Fiastra. The route passes the Lame Rosse and reaches the cave: it is a long, demanding itinerary that takes much of the day, with no facilities along the way. Details and directions are on the page Grotta dei Frati: how to get there and trails. For the surroundings, the page on the gorges and valleys of the Sibillini describes other valleys of the park.

Grotte dell'Orso (Bolognola). The Grotte dell'Orso (the Bear's Caves) are two caves of the same name in the Bolognola area, in parallel valleys. They are remembered as the last dens of the bear in the Sibillini Mountains, until the 18th century. One is near the Cascata dell'Acquasanta, the other in the Vallata del Fargno, on the Costa delle Vetiche.

For the Valle dell'Acquasanta, start from Bolognola: from the square, behind the church, follow the signs for the waterfalls and drive to the last houses of the village. Park and walk down toward the Fiastrone. A trail then climbs the opposite valley through the woods and in about two hours, on a comfortable and level route, leads to the Cascate dell'Acquasanta. The path runs above the channel that carries water to the Bolognola power station, and halfway along there is a large metal pipe. Water lovers can combine the visit with the waterfalls, covered on the page Waterfalls of the Sibillini Mountains in the Marche.

Spring, between May and June, is the recommended time for these routes. They can be combined with the climb to the sources of the Fiastrone and the Forra dell'Acquasanta, a ravine where large snow deposits still remain.

Caves of the Sibillini Mountains: visiting tips

Check conditions before setting out. The interior of the Grotta della Sibilla cannot be visited. After the earthquake, some stretches of trail, in particular the branches toward the stream in the Fiastrone valley, should be checked before walking them. As with any mountain hike, check the weather.

Bring supplies. There are no facilities along the Grotta dei Frati trail, so carry water and food. For supplies, Lago di Fiastra is a few kilometers away by car.

Footwear. Hiking shoes and comfortable clothing are advisable. The route from the Lame Rosse to the Grotta dei Frati has a steep descent, with sometimes slippery sections. On the Sibilla, the "Corona" section is fitted with chains and the trail from the hut is exposed to the sun.

Choose the route based on time. The Grotta dei Frati from the Cessapalombo side takes about three hours there and back. From the Fiastra dam it takes about five hours. The Sibilla loop takes just over four hours of walking, excluding stops.

Combine nature and culture. The Montemonaco museum helps explain the legend. For other places nearby, see the pages Picnic areas in the Sibillini and The peaks of the Sibillini Mountains.