Once a behemoth armed with a fleet of Soviet fighter jets, the Zeljava airbase carved into a mountain between Bosnia and Croatia and designed to withstand a nuclear strike, sits idle for decades, with the crumbling facility attracting little more than the occasional tourist for years. The airbase was constructed in secrecy in the 1960s in what was then Yugoslavia -- a socialist federation that sought a middle ground between Moscow and Washington during the Cold War. "I was really impressed by the raw, authentic nature of the infrastructure that has been left untouched over the last 30 or 40 years since its abandonment," says visitor Mario Garbin. IMAGES AND SOUNDBITES