Postojna Cave

Škocjan's opposite, and the better Slovenian choice for families or anyone who cannot manage a thousand steps. Postojna opened the world's first cave railway in 1872, and today a double-track train carries visitors on a 3.7 km ride inside before an easy walk on a footpath among the formations. The whole visit takes about an hour and a half, and the operator describes it as suitable for visitors with mobility impairments. Bring a warm layer, because the cave stays at 10°C all year. The other highlight is the olm, the largest cave-dwelling animal, which can go up to ten years without food. Pairing the two caves in one Karst trip shows the range of the region better than any single site.