Italy is famous for its Roman ruins, Renaissance cities, spectacular mountains, and Mediterranean coastline. Hidden beneath its landscapes, however, lies another extraordinary world: thousands of caves carved over millions of years by water, volcanic activity, glaciers, and tectonic forces.

From enormous cathedral-like chambers filled with towering stalactites to underwater sea caves glowing brilliant blue, Italy offers one of Europe’s richest collections of accessible caverns. While places such as the Frasassi and Castellana caves attract hundreds of thousands of visitors each year, many lesser-known caves remain hidden gems waiting to be discovered.

This guide travels from north to south through every Italian region, highlighting both the famous attractions and the secret underground treasures.

Valle d’Aosta

Although Valle d’Aosta is better known for glaciers and Alpine peaks than caves, several underground sites are worth visiting.

Saint-Marcel Mining Galleries

Rather than natural caverns, these historic mining tunnels date back centuries and reveal how miners extracted iron and copper from the mountains.

Highlights include:

ancient mining passages
mineral formations
guided geological tours
alpine scenery

Busserailles Gorge

Near Cogne, water has carved spectacular rock tunnels through limestone over thousands of years.

Piedmont

Piedmont contains some of northern Italy’s finest karst caves.

Bossea Caves (Cuneo)

Discovered in the nineteenth century, Bossea is among Italy’s oldest tourist caves.

Features include:

underground waterfalls
rivers
fossil remains
huge chambers over 60 meters high

One of its most impressive attractions is the constant sound of flowing underground water.

Caudano Caves

Much less visited than Bossea, these caves feature spectacular limestone formations and adventurous guided routes.

Liguria

The limestone mountains behind the Ligurian coast hide an extensive cave network.

Toirano Caves

Among Italy’s most important prehistoric caves, Toirano contains:

prehistoric human footprints
cave bear remains
impressive stalagmites
archaeological discoveries

Borgio Verezzi Caves

Known as Italy’s most colorful show caves thanks to unusually rich mineral deposits.

Visitors admire:

red formations
orange calcite
white columns
underground lakes

Lombardy

Lombardy has relatively few tourist caves but several remarkable underground systems.

Buco del Piombo (Como)

An enormous cave entrance overlooking Lake Como.

It served as:

prehistoric shelter
medieval refuge
military hideout

Grotte di Rescia

Near Lake Lugano, these caves combine waterfalls with illuminated chambers.

Trentino-Alto Adige

Varone Waterfall Cave

One of Italy’s most spectacular waterfall caves.

Water plunges nearly 100 meters through a narrow limestone canyon carved over 20,000 years.

Grotta del Calgeron

An impressive cave system famous for:

crystal-clear streams
narrow passages
stalactites
adventurous excursions

Veneto

Covolo di Camposilvano

Often called “The Bell of the Alps,” this enormous sinkhole resembles an underground cathedral.

Oliero Caves

Located in the foothills of Monte Grappa, these water-filled caves can even be explored by boat.

Friuli Venezia Giulia

The Karst Plateau around Trieste is internationally famous among speleologists.

Grotta Gigante

One of the largest accessible cave chambers in the world.

The main hall measures approximately:

280 meters long
65 meters wide
nearly 100 meters high

Its enormous scale has earned several international records.

Torri di Slivia

A magnificent cave with elegant limestone columns and excellent guided tours.

Emilia-Romagna

Onferno Caves

Located within a protected nature reserve.

The caves are famous for:

one of Italy’s largest bat colonies
underground streams
educational nature tours

Spipola Cave

Near Bologna, this cave is popular with experienced speleologists.

Tuscany

Tuscany hides one of Europe’s largest cave systems.

Antro del Corchia

The Corchia mountain contains over 70 kilometers of explored passages.

Visitors experience:

gigantic chambers
crystal formations
underground rivers
advanced lighting installations

Equi Terme Caves

These caves combine geology with archaeology and paleontology, including Ice Age animal remains.

Marche

Frasassi Caves

The undisputed queen of Italian caves.

Discovered in 1971, Frasassi contains chambers so enormous they could hold Milan Cathedral.

Highlights include:

Ancona Abyss
Giant Hall
Crystal Lake
spectacular calcite formations

The cave complex stretches for more than 30 kilometers.

Umbria

Monte Cucco Cave System

Among Italy’s premier destinations for technical caving.

Only experienced visitors with guides may explore many sections.

Lazio

Collepardo Caves (Grotte di Collepardo)

Known as the “Caves of Wonders.”

Visitors admire delicate limestone curtains and columns.

Nearby lies the fascinating Certosa di Trisulti monastery.

Abruzzo

Stiffe Caves

Unlike many dry caves, Stiffe is an active resurgence cave.

Visitors encounter:

underground waterfalls
rivers
echoing chambers
dramatic lighting

Molise

Pozzo della Neve

A fascinating cave historically used to preserve snow throughout the summer before refrigeration.

Campania

Blue Grotto (Grotta Azzurra)

Perhaps Italy’s most famous sea cave.

Sunlight entering beneath the water creates its legendary electric-blue glow.

Small rowing boats carry visitors through the narrow entrance.

Pertosa-Auletta Caves

Unique because visitors begin part of the tour aboard boats navigating an underground river.

The cave also preserves archaeological remains from prehistoric settlements.

Apulia (Puglia)

Apulia contains some of Italy’s richest karst landscapes.

Castellana Caves

Italy’s longest tourist cave route extends about 3 kilometers.

The spectacular White Cave is frequently described as one of the world’s most beautiful cave chambers.

Other highlights include:

enormous domes
deep sinkholes
brilliant white calcite
dramatic lighting

Zinzulusa Cave

Near Castro, overlooking the Adriatic Sea.

Its name comes from limestone formations resembling hanging rags (“zinzuli” in local dialect).

The cave features:

sea water pools
impressive stalactites
marine biodiversity

Basilicata

Castelcivita Caves (border with Campania)

Although often associated with Campania, these spectacular caves extend close to Basilicata and are frequently included in regional cave itineraries.

Their chambers display magnificent limestone formations over several kilometers.

Calabria

Romito Cave

One of Italy’s most significant prehistoric archaeological sites.

Visitors can see:

Paleolithic rock engravings
ancient human burials
remarkable stone carvings

Sicily

Sicily offers extraordinary volcanic and prehistoric caves.

Grotta del Gelo

Located on Mount Etna, it is Europe’s southernmost glacier cave.

Ice persists year-round despite Sicily’s warm climate.

Grotta del Genovese

Located on Levanzo Island.

This prehistoric cave contains exceptional:

rock paintings
engravings
Neolithic artwork

Grotta Mangiapane

A huge cave transformed into a traditional Sicilian village museum.

Sardinia

Sardinia may be Italy’s greatest cave destination after Marche and Puglia.

Neptune’s Grotto

Near Alghero, this spectacular sea cave is reached by boat or via the famous Escala del Cabirol staircase with more than 650 steps.

Inside visitors discover:

giant stalactites
saltwater lakes
immense chambers

Bue Marino Cave

Once inhabited by the endangered Mediterranean monk seal.

Boat excursions explore its marine passages and prehistoric rock engravings.

Su Mannau Cave

A paradise for serious cavers.

The cave extends for over 10 kilometers and combines archaeological importance with stunning limestone formations.

Italy’s Hidden Cave Gems

Many visitors know only Frasassi or Castellana, but these lesser-known caves reward adventurous travelers:

Caudano Caves (Piedmont)
Torri di Slivia (Friuli Venezia Giulia)
Onferno Caves (Emilia-Romagna)
Equi Terme (Tuscany)
Stiffe Caves (Abruzzo)
Collepardo Caves (Lazio)
Su Mannau (Sardinia)
Grotta del Calgeron (Trentino)
Zinzulusa (Puglia)
Romito Cave (Calabria)

Best Caves for Different Interests

Interest	Recommended Cave
Largest chambers	Frasassi (Marche)
Best sea cave	Blue Grotto (Capri)
Most colorful	Borgio Verezzi (Liguria)
Best archaeological cave	Toirano (Liguria)
Best prehistoric art	Grotta del Genovese (Sicily)
Best waterfall cave	Varone (Trentino)
Best underground river	Pertosa-Auletta (Campania)
Best family destination	Castellana (Puglia)
Best for geology	Antro del Corchia (Tuscany)
Best for experienced cavers	Monte Cucco (Umbria)

Planning Your Underground Adventure

Italy’s caves can be visited throughout the year, making them ideal destinations even during the hottest summer months. Temperatures inside most caves remain constant between 10°C and 16°C (50°F–61°F), so bringing a light jacket and comfortable, non-slip shoes is always recommended.

If you have time for only a few, the country’s true underground masterpieces are Frasassi in Marche, Castellana in Puglia, Grotta Gigante in Friuli Venezia Giulia, Antro del Corchia in Tuscany, Neptune’s Grotto in Sardinia, and the magical Blue Grotto on Capri. Together, they showcase the astonishing geological diversity hidden beneath Italy’s surface, from Alpine karst systems to volcanic ice caves and shimmering Mediterranean sea grottos. These remarkable sites reveal that some of Italy’s greatest natural wonders are not found on mountain peaks or along its famous coastlines—but deep underground, waiting to be explored.