Grotta gigante, the world's largest tourist cave in Trieste, Italy

it's amazing cave ever seen, the first time to see such a large and deep cave
this cave 's depth about 100 m and we walked which led by the tour guide who explained us in Italian and then English recorded voice. the temperature was at least 7 C in the cave. the cave contains many large stalactites and stalagmites ,Many of exceptional beauty.
more please read at http://en.wikipedia.org/wiki/Grotta_Gigante