The Grotta Gigante
Giant Cave

Sgonico, Trieste

Sgonico, Trieste

The Grotta Gigante – Giant Cave


In the Grotta Gigante, open to the public since 1908 and located in the province of Trieste, you will find an exciting reality where tourism, environment, and scientific research mix. Here nature shows itself in forms and colors of rare beauty and science hides under the Earth’s surface to better study our planet. The cave is one of the most interesting tourist sites in the Friuli Venezia Giulia region and in the province of Trieste, a multicultural city due to its historical and geographical characteristics, which every year attracts numerous tourists and scientists from all over the world. Every year more than 90,000 visitors test a unique experience in our cave, which is capable of giving unforgettable memories.

The Grotta Gigante owes its name to the imposing size of the cave. It is, in fact, the tourist cave with the largest room in the world. The great cavern, the main room of the cave, has a volume of 365,00 cubic meters and measures 98.5 meters in height, 167.60 in length, and 76.30 in width.

Guided Tour

The visit to the Grotta Gigante lasts 1 hour and is carried out with expert guides who accompany visitors through the 850-meter long path, descending 100 meters below the Earth’s surface. The constant temperature is +11 °C – 51.8 °F. It is open all year round and, inside the visitor center, you can visit the Speleological Scientific Museum for free, where there is also a station for a virtual tour of the cave reserved for both the people with disabilities and those with mobility difficulties.

The visiting experiences are also enriched with underground aperitifs, in which visitors can taste the typical wines of the Karst in a one-of-a-kind setting, and the 8-meter high tower where they can experiment with the first sport climbing techniques.

Cave length

365,000 mᵌ, with 850 meters equipped for tourism

Average temperature

11 °C – 51.8 °F

Duration of the visit

About 60 minutes

How to find us

Borgo Grotta Gigante 42 / a
34010 – Sgonico (TRIESTE)