Grotta Gigante
A giant karst cave with a main chamber about 107 meters high, once listed by Guinness as the world's largest tourist-accessible single cave chamber.
Grotta Gigante lies on the karst plateau north of Trieste, in the village of Borgo Grotta Gigante. Entry is only with a guided tour, which takes about an hour and involves roughly 500 steps up and down. The chamber is enormous, with stalactites and stalagmites rising like forests. Inside, an extra-long pendulum instrument hangs for measuring crustal deformation. Admission is about 17 euros; there are fewer tours in winter, and it may close on Mondays. From the city center, take bus line 42 or drive for about 20 minutes.
Opening hours
Approx. 10 am–6 pm (by tour time slots; shorter in winter)
Nearby sights
- Sanctuary of Monte Grisa
- Barcola Seafront
- Strada Napoleonica
- Victory Lighthouse
- Porto Vecchio & Magazzino 26
- Miramare Castle
- Molo Audace
- Canal Grande & Borgo Teresiano