Željava was one of the most secret military sites in Yugoslavia: an airbase tunnelled into the mountain of Plješivica, on the border between Croatia and Bosnia and Herzegovina, so that fighter aircraft could shelter from a nuclear strike and fly out of hardened hangars. Construction took place during the Cold War and the complex was often described as one of the largest underground airbases in Europe, with long tunnels, blast doors, control rooms, fuel and ammunition stores and a runway that ran across the frontier. It was blown up by the retreating army in 1992 at the start of the Yugoslav wars, and what remains is a vast concrete shell, partly collapsed and wholly silent. Guided tours from the Plitvice area take visitors to the surface structures and, where it is safe, some of the interior, with a guide to explain the history, the layout and the dangers.
What you see
The surface runway, the apron with its hardened pads, the entrances to the mountain tunnels, and the remains of control and accommodation buildings. Inside, the tunnels are wide enough for aircraft and are dark, damp and echoing, with heavy blast doors left twisted by the demolition. The scale is what stays with people, because the concrete runs on far beyond the reach of a torch beam. Nature has begun to take the site back, with moss, saplings and cracks in the paving, which adds to the sense of a place stopped mid-sentence.
Why a guide matters
The area was affected by conflict in the 1990s, and some ground in the region remains hazardous. Walking only with a local guide who knows which routes are cleared and which structures are stable is not a formality but the whole basis of a safe visit.
Stay on the paths you are shown, do not wander off to look at other buildings, and keep children close. The guide also supplies the context that makes the ruins mean something, from why the mountain was chosen and how the base was meant to work to the story of its end.
Practicalities
The base lies in the Lika region south-west of Bihać, a drive of roughly an hour from the park, and tours are normally run as a half-day excursion with transfers from the Plitvice area. Wear sturdy shoes with a good tread, bring a torch or head torch if the operator does not provide one, and dress warmly, because the tunnels stay cool even on hot days.
The site is exposed, so a hat and water matter in summer and a windproof layer matters in the colder months. The border position means you should carry your passport or identity card, as a guide will advise.
Who it suits
Visitors with an interest in military history, urban exploration or the story of the former Yugoslavia, and photographers who like abandoned places. It is not a polished heritage attraction with displays and a cafe; it is a raw site, and the experience depends on the guide. It is also a good alternative on a day when the lakes are iced or crowded, since it can be visited in most seasons, subject to weather and the operator.
What to expect
The experience
A guided walk around the runway and tunnel entrances of an abandoned underground airbase, with commentary on its history and demolition.
Best time
Dry days in spring and autumn, when the ground is firm and the light on the concrete is good.
How long
Three to four hours on site, plus the drive to and from the Plitvice area.
Tips
Go only with a guide, wear sturdy shoes, bring a torch and a warm layer, and carry identification because of the border location.
Quick picks
- Best for
- Military history fans and anyone who likes abandoned, atmospheric places.
- Families
- Better for teenagers than small children, because of the uneven ground, the dark tunnels and the need to stay on guided paths.
- Couples
- A distinctive, off-the-beaten-path afternoon for curious travellers.
- Pair with
- A night near the park and the Lower Lakes next morning, as a contrast to the nature of the park.
- Time needed
- Half a day with transfers.
Good questions
What is Željava?+
It was a Yugoslav Cold War airbase built into a mountain on the Croatia and Bosnia border, with tunnels, hardened hangars and a runway. It was destroyed by the retreating army in 1992 and is now a ruin.
Can I visit without a guide?+
A guided visit is strongly advised. Some ground in the wider region remains hazardous after the 1990s conflict, and a local guide knows which paths and structures are safe.
Is it suitable for children?+
Older children and teenagers who can keep to the path will enjoy it. The ground is uneven and the tunnels are dark, so it is not ideal for toddlers or prams.
How far is it from Plitvice Lakes?+
Roughly an hour by road, and tours usually pick up from hotels or meeting points in the Plitvice area.
What should I bring?+
Sturdy shoes, a warm layer, a torch or head torch, water and your passport or identity card because the site is near an international border.
