Descend into the largest cave system in Europe — 24km of subterranean cathedrals alive with stalactites — then visit a castle literally built into a cliff face. An otherworldly double-bill that simply cannot be replicated anywhere else on earth.
What to expect
Board a miniature electric train that whisks you deep into a glittering underworld of 5-metre stalactites and 100,000-year-old formations. Your guide narrates the cave's wartime and scientific history at a pace you set. Emerging back into daylight, a 15-minute drive brings you to Predjama Castle, a Renaissance fortress wedged dramatically into a 123-metre cliff — the world's largest cave castle. Finish with a glass of local Teran wine before the return journey to Rijeka.
Good to know
Postojna is approximately 1 hour 15 minutes from Rijeka port by private car. Book the combo ticket online in advance — cave timed-entry slots sell out weeks ahead in summer. Allow 4–5 hours on site; total excursion is 7–8 hours. Check your ship's all-aboard time carefully and build in a 90-minute buffer.
Sail there
Luxury cruises that call at Rijeka — book through us, the fare is identical and your concierge stays on your side.