Eisriesenwelt is the largest ice cave on the world. It is really beautiful, if you are around Salzburg you must see it. It is around 40 kms south from Salzburg. By car you can go on the A10 highway, or take the train from Salzburg.
From the car park you walk some 10 minutes to the cable car.
The cable car is also a special one, the steepest I've ever seen. It does 500 metres height difference in a couple of minutes. The view from those cars really rocks.
The car takes you to a Hütte, which is a kind of little mountain restaurant. From here again a 10 minutes walk to the cave.
It's also possible to get to the entrance area of the cave on foot, but it takes more than one and a half hour, and I guess, having seen those paths, it's quite tiring...