The cave is massive and well worth a visit but be prepared for a steep climb on the way back up. More

While taking the tram from Trieste to Opicina, on a fluke we decided to wait for the #42 bus out of Opicina to the 5th largest cave in the world, and it was SO worth it! 500 steps down, 500 steps up, all with my 77 year old mom's bad knee! It is a guided tour, with a very knowledgable... More

Visiting the Grotta Gigante was definitely worth it! Seeing the Grotta was like being on the set of an Indiana Jones movie. It was such a great natural wonder to behold. The stairs were not too taxing so don't be scared by the warnings. We took the Opicina Tramway up, transferred to the 42 bus line and arrived at the... More

We went to the Grotta Gigante with a 1 1/2 year old babygirl. The 500 steps down and 500 steps up is a bit too much for small feet, but if you can carry the little one on the arm the entire way, don't cheat yourself for a visit to this amazing cave. There was no waiting time at the... More

Wauw what a place. It's just an experience you have to get and discover. Yes there are a higher humidity and yes there's 500 step both way, just take it easy and enjoy. Just go, yeh come on :-) GO I said^^ More

Brilliant, could not believe it, quite stunning, 500 steps down and 500 up, this is taken very gently with plenty of places to stop, guide is good and interesting Easy to get to by bus or tram More

This cave is amazing, the guide was good, the 500 (yes, 500!) steps down were not too bad and the 500 up were not so bad either. Plenty of places to stop and catch your breath. I got the Tram from central Trieste to Villa Opicina, but it is too far to walk (in my opinion) to the caves from... More

Though the Grotto Gigante is impressive, at the end of the day its just a big hole in the ground. Iif you want to see some very very impressive caves travel further west across the border in to Slovenia to the caves in Postojna. These are far more impressive and definitely worth the extra half hour drive!! More

I feel I am fairly well travelled but this was just one of the most amazing places I have ever seen! Completely took my breath away! Just the biggest caven you can possibly imagine ....and then multiply that by 10! There are huge stalegmites that are over 200,000 years old .... and still growing!! Yes there are a lot of... More