A visitor uses his flashlight as he walks inside a dark tunnel at the Zeljava underground army airbase in the heart of the Pljesevica mountain, on the Croatian border with Bosnia. Photo: AFP
Like something out of a Bond film, the giant Zeljava airbase was carved into a mountain between Bosnia and Croatia and designed to withstand a nuclear strike.
But for decades it sat idle, with only the occasional intrepid tourist daring to venture into its crumbling cavernous core.
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