The largest cave in the karst region and most famous show cave in all of Europe, words on a page can hardly do justice to the majesty of Postojna. So far, more than 20 kilometres of galleries have been found, of which only 5km are open to the public. All the same, a visit here still takes up much of a morning or an afternoon, as you make your way through the most spectacular parts of the cave, at first by a dinky little narrow-gauge train, and then on foot. There are no stairs or difficult climbs along the path to or inside the cave, so visitors with limited mobility should not have any difficulties.

Highlights of the cave include the enormous stalactites and stalagmites, and the quite sensational Concert Hall, which can (and does) hold 10,000 people. The caves are also home to olms (or white salamanders), a blind amphibian endemic to the subterranean waters of caves of this part of Europe. The olms can sometimes – though not always – be seen in some of the pools of water as you make your way around the cave. Though blind they are sensitive to flash photography and if you do spot one you should refrain from taking any photos. You will be well and truly told off if you do.