Between 1950 and 1990, Yugoslavia built one of the most extensive underground military networks in Cold War Europe — approximately 26 underground nuclear facilities at strategic points, including command shelters, weapons factories and military bases. Up to 50 secret military bunkers were built across Yugoslavia during the Cold War, according to retired Slovenian army officer Marijan Kranj. In Slovenia, bunkers at Škrilj and Gotenica were built for the political elite and hidden deep within forests for maximum security. Discover the 5 best Yugoslav bunkers in Slovenia, selected from our Slovenia Urbex Map — 150+ verified GPS locations across Slovenia.
Why Slovenia Has the Most Significant Yugoslav Bunker Heritage in the Former Republic
Slovenia's unique geopolitical position within Yugoslavia — sharing borders with two NATO members (Italy and Austria) while remaining a Warsaw Pact non-member — made it the front line of Tito's active neutrality doctrine. If nuclear war began, Slovenia was where the NATO missiles would first cross; accordingly, its bunker network was the most strategically significant of any Yugoslav republic, and the most carefully concealed.
1. Bunker K-35 (Škrilj) – Kočevski Rog, Dense Forest — Built 1957, Nuclear Command Communication Shelter, Preserved Near-Original Condition, Open to Visitors Since 2017 (Known Location)
The Škrilj Bunker, together with its home facility in Gotenica, has been the cause of many stories and rumours for decades — after all, one of the most protected areas of Slovenia was arousing a lot of curiosity, although — or precisely because of this — only a few people were allowed to enter it. Built in 1957 and located deep in the Kočevski forest near the village of Škrilj, the K-35 bunker opened its doors to visitors for the first time in 2017. The facility served as the communication support unit for the main Gotenica command bunker. The facility was built by President Tito at the time of the Cold War threat between Yugoslavia and Russia and has remained almost in the same state as in the time of its upgrading sixty years ago — when we cross its threshold, we suddenly find ourselves in a time capsule.
🔗 Sources: Kočevsko – The Škrilj Bunker: Voices from the Underworld | Slovenia Times – K-35 Bunker
2. Gotenica Command Bunker – Kočevski Rog, Virgin Forest — Main Yugoslav Nuclear Command Facility for Slovenia, Built 1950s, Now Interior Ministry Archive (Known Location)
In Gotenica, Slovenia, the Gotenica underground bunker was built in the 1950s in a rocky hillside that provided it with natural protection, and was a strictly guarded secret until Slovenia won independence in 1991. Today, the Ministry of the Interior and the Slovenian Film Center store archival films in the climate-controlled former bunker. The main facility — larger than the K-35 communication support unit — was built to shelter Yugoslavia's top political and military leadership and is documented by the Boston Globe as an extraordinary example of Cold War nuclear paranoia expressed in reinforced concrete, hidden in the Kočevski Rog forest. While currently in active use as an archive, its exterior and approaches are accessible in the Kočevski Rog protected area.
🔗 Also read: Top 5 Abandoned Places in Slovenia →
3. Maribor Nazi Underground Factory (Tezno Tunnels) – Maribor, Tezno — WWII Nazi Aircraft Engine Factory, 15m Below Surface, Predecessor to Yugoslav Industrial Underground
While technically a WWII Nazi facility rather than a Yugoslav bunker, the Tezno tunnels beneath Maribor represent the direct antecedent of Yugoslavia's own underground industrial and command infrastructure — and were incorporated into the Yugoslav-era industrial zone built on the same site. The Tezno Tunnels service is designed in the form of a tourist guidance through the underground tunnels of the former Styria Aircraft Factory, where visitors learn about the reasons for the factory and tunnels' construction and their importance for the military industry of the Third Reich. Tito's bunker builders learned directly from what they found in Tezno; the underground philosophy of hiding strategic infrastructure in rock was Yugoslav Cold War doctrine derived in part from Nazi practice. GPS in our Slovenia Urbex Map.
4. Decommissioned JNA Barracks – Slovenia — Yugoslav People's Army Infrastructure, Post-1991 Abandonment, Parade Ground, Military Murals (Off the Radar — Our Map Only)
When Slovenia declared independence and the ten-day war ended in July 1991, the Yugoslav People's Army's entire Slovenian infrastructure was decommissioned. Several JNA barracks complexes across Slovenia stand in various states of abandonment or partial reuse — retaining the specific Yugoslav military aesthetic: five-pointed stars, socialist realist murals of brotherhood and defensive readiness and the parade ground infrastructure of an army with no successors. The Pivka barracks — now the Pivka Military History Park — is the most developed example, but the documentary record shows multiple smaller JNA installations across Slovenia in less-documented states of dereliction. GPS in our Slovenia Urbex Map.
5. Undocumented Cold War Alpine Bunker – Northern Border Zone — Yugoslav NATO-Facing Fortification, Alpine Rock-Cut Construction, Post-1991 Decommission (Exclusively on Our Map)
Along Slovenia's northern border with Austria — the NATO frontier that Yugoslav military planners considered the most likely invasion axis — a series of Cold War fortifications were built into the alpine limestone in the 1950s and 1960s. These smaller-scale bunkers and observation positions are less documented than the elite Kočevski Rog nuclear command facilities, but represent the operational layer of Yugoslav active neutrality doctrine: the infantry and artillery positions that would slow a NATO or Warsaw Pact advance long enough for the leadership to reach the forest shelters. Several remain in largely undocumented states of abandonment on the alpine slopes of the Karavanke range. GPS exclusively in our Slovenia Urbex Map.
❓ FAQ
What is the most famous Yugoslav bunker in Slovenia?
The K-35 Škrilj bunker in Kočevski Rog — built in 1957, preserved in near-original condition and open to visitors since 2017. Part of a two-facility nuclear command network with the main Gotenica bunker, specifically designed to shelter Yugoslavia's political and military leadership in case of Soviet nuclear attack. Over 10,000 visitors have toured it since opening.
How many Cold War bunkers are there in Slovenia?
Up to 50 secret military bunkers were built across Yugoslavia during the Cold War, according to retired Slovenian army officer Marijan Kranj. Slovenia's share of this network is estimated at several dozen facilities of varying scale — from the elite nuclear command shelters of Kočevski Rog to smaller infantry and observation positions along the northern and western borders. Many remain undocumented in English-language sources. Our Slovenia Urbex Map covers all verified accessible sites.
Can I visit the Gotenica bunker?
The Gotenica main command facility is in active use by the Slovenian Ministry of the Interior and the Slovenian Film Center as a climate-controlled archive. Interior access is not publicly available. The exterior and approach in the Kočevski Rog forest are accessible. For interior access to a Yugoslav Cold War bunker in near-original condition, the K-35 Škrilj bunker (open since 2017) is the recommended visit.
Safety Tips
- Wildlife: Kočevski Rog has one of the highest brown bear densities in Europe — make noise when moving through the forest to avoid surprise encounters
- Underground sites: always carry two independent light sources in any bunker or tunnel — never enter unmaintained sections alone
- Alpine bunkers: northern border zone fortifications may have unstable rock-cut ceilings — assess structural integrity before entering
- Never explore alone — always bring at least one other person and share your location before entering any underground site
The urbex code: "Take nothing but photographs, leave nothing but footprints."
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