Since 1818 · 24 km of darkness
Descend into the underworld
One of Earth's great karst caves — explored by an electric railway since 1872, home to a creature that has never seen the light.
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One of Earth's great karst caves — explored by an electric railway since 1872, home to a creature that has never seen the light.
The cave, in numbers
Two centuries of wonder, carved by water into limestone. A world that runs colder, older and stranger the deeper you go.
An open electric train glides 3.7 kilometres into the mountain, past galleries no walk could reach. A ride invented in 1872 — and still the most thrilling way in.
Electric cave train · est. 1872
Still growing, one drop at a time, for tens of thousands of years. Move your cursor — the cave only reveals what the light touches.
↳ Lit by hand, like every formation on the route
The olm — Slovenia's "baby dragon" — spends a century in total darkness, can endure years without food, and exists almost nowhere else on Earth. Meet it at the cave's vivarium.
The largest chamber on the route has acoustics so rare that orchestras descend to play in it. Each winter, it becomes the stage for the living nativity — a hundred performers beneath the stalactites.
Concert Hall · ~10,000 capacity
Predjama Castle · 9 km away
Nine kilometres on, the world's largest cave castle clings to a 123-metre rock face — home to the legend of the knight Erazem. Pair it with the cave for the complete karst day.
Tap the points along the passage to compose a route. We'll carry it straight into your booking.
The full 1h30 journey — train in, the great galleries, the Brilliant, and back through the Concert Hall.
Everything in the Classic, plus the Vivarium and EXPO — face to face with the olm and the karst's hidden life.
The cave to yourself after closing, a biologist as your guide, and a glass raised in the Concert Hall. By arrangement.