About Postojna Cave
Postojna Cave (Postojnska jama) is the most visited cave in Europe and one of the world's most spectacular karst systems. The cave stretches over 24 km, making it the second-longest publicly accessible cave system in Europe (after Mammoth Cave, USA for total length). What sets Postojna apart from other show caves is the unique underground railway — visitors ride a small electric train 3.5 km into the heart of the cave, covering the distance in 15 minutes. The tour then continues on foot through vast chambers including the Great Hall (300 x 90 x 30 metres), the Petra Hall, and the exquisite White Hall with its pristine white stalactites. The cave was formed over millions of years by the Pivka River, which still flows through the lower passages. The temperature stays at a constant 8-10°C. The cave's most famous resident is the olm (Proteus anguinus), also known as the 'human fish' — a blind, pink amphibian that lives exclusively in the Dinaric Karst underground waters and can live to 100 years old. The Proteus vivarium at the cave entrance displays live olms in a recreated underground environment (included with cave entry). The Predjama Castle connection is another highlight — a 9 km underground passage connects the cave to Predjama Castle (not open to the public, but the story is fascinating). Postojna Cave was first described in the 17th century by Valvasor, opened to tourists in 1819 (when Archduke Ferdinand I visited), and the railway was installed in 1872 — the same year the first electric lighting was tested in a European cave. The cave hosts occasional concerts in the Great Hall (exceptional acoustics — the Vienna Philharmonic has performed here). The karst research centre at the cave entrance conducts ongoing speleobiology research. The cave's formations include extraordinary examples of stalactites, stalagmites, flowstones, helictites (gravity-defying formations), and cave pearls (€2-5 for a small souvenir at the gift shop).
🗓 Best Time to Visit
Open year-round (constant 8-10°C in the cave, so no season is bad). July-August is busiest with queues up to 45 minutes — book online and arrive early. May-June and September-October offer the best balance of manageable crowds and pleasant above-ground weather. November-March is quiet with fewer tours (check the schedule). Avoid visiting during heavy rain when the cave may flood lower passages (rare but possible Nov-Mar). The outdoor park and Proteus vivarium are best in summer.
🍽 Food & Drink
Postojna town has several restaurants (the cave complex has a self-service buffet that's acceptable for a quick meal but not memorable). Must-try dishes in the area include jota (€8-12), pršut (Karst ham, €6-9), and local trout from the Pivka River (€12-16). The Postojna region is known for its teran wine (€2-3 per glass). For a proper meal, skip the cave buffet and walk into Postojna town (15 min walk or 5 min drive). Restaurants: Gostilna Kraški Kras (mains €10-16, a 10-minute walk from the cave, good jota and grilled meats), Restaurant Jama (mains €8-14, near the cave entrance, decent Slovenian fare). For picnic supplies, the Mercator supermarket in Postojna town has everything.
🚗 Getting There & Around
By car: Postojna is on the A1 motorway, 45 km from Ljubljana (35 min). The cave has a large car park (free). By train: Postojna station is on the Ljubljana-Koper line (€5-8, 1 hour, 6 daily trains). The station is 2 km from the cave entrance — a 25-minute walk or €5-7 taxi. By bus: Direct buses from Ljubljana (€7-10, 1 hour, hourly). The bus stop is a 10-minute walk from the cave. By tour: Almost every Ljubljana tour agency runs half-day trips to Postojna (€45-65 including transport and entry, book 24h ahead). Combined tours with Predjama Castle (€55-75) are the most popular option.
🏨 Best Hotels Near Postojna Cave
There's no accommodation at the cave itself. Postojna town has Hotel Jama (€70-100/night, 5-min walk from the cave, clean and comfortable). For a unique experience, Hotel Grad Predjama (€80-120/night, in the castle's former stables, 9 km from the cave) offers castle accommodation. Guesthouse Pr' Štirbarok (€50-65/night) is a good budget option in Postojna town. For a rustic Karst experience, tourist farms in the area offer farm stays (€45-65/night with breakfast — ask at the Postojna tourist office). Most visitors day-trip from Ljubljana.
🍽 Where to Eat Near Postojna Cave
The cave complex has a self-service restaurant (mains €8-14, open during cave hours) — functional but not special. For better food, Gostilna Kraški Kras (Titov trg 1, Postojna, €10-16 mains, 10 min walk from the cave) is the best option — try the jota or grilled meats. Gostilna Jama (mains €8-14, just outside the cave entrance) is convenient with decent schnitzel and pizza. For a special meal, take the 9 km drive to Gostilna Špacapan in Škocjan (€12-22 mains, excellent Karst cuisine). The Postojna Central Market (Saturday mornings) has good local produce for a picnic. Pack a sandwich — the cave complex allows picnics in the outdoor park area (but not inside the cave).
🎯 Things to Do at Postojna Cave
Take the standard cave tour (€30/adult, €22/child, includes train ride + guided walking tour, 1.5 hours, English tours every hour). Book tickets online at least 24 hours ahead to secure your preferred time slot. Visit the Proteus Vivarium (included with cave entry, allow 20 min, live olms on display). Ride the electric train deeper into the cave (the 15-minute ride is magical — sit on the left side for the best views). Take the extended Korotan Tour (€39/adult, 2.5 hours, explores higher-level galleries with rarer formations — 1 tour per day at 13:30, book 48h ahead). Combine with Predjama Castle (combo ticket €42/adult, saves €8). Visit the Karst Research Centre exhibition (free with cave entry, interesting geology displays). Walk the Postojna Park trails (free, 2 km loop through the karst landscape above the cave). Visit the cave shop (unique souvenirs including olm plush toys, €8-15). Take a photo at the cave entrance (the iconic arched doorway is a classic shot). Attend a concert in the Great Hall (€20-35, 1-2 per month in summer, truly exceptional acoustics — check the schedule).
💡 Insider Tips: Book tickets online at least 24 hours ahead — same-day tickets sell out in summer (especially 10am-2pm slots). The first tour of the day (usually 9am) has the shortest queue. The train ride is front-facing on the way in (best seats on the left) and rear-facing on the way out (any seat is fine). The constant 8°C is cold — bring a jacket even in summer (the gift shop sells fleeces for €25 if you forget). Skip the expensive photo package sold at the end — take your own photos (camera allowed, no flash or tripod). Combine with Predjama Castle for a morning-afternoon split day. The extended Korotan Tour is worth it for serious cave enthusiasts but skip it if you're tight on time or budget.