27/07/2026
📍🇭🇷 Željava Air Base, also known as Objekt 505, is a legendary abandoned underground military airbase located on the border of Croatia and Bosnia and Herzegovina. Built in secrecy during the Cold War, it was once one of the largest and most advanced underground airbases in Europe, designed to withstand nuclear attack. Today, its massive tunnels, abandoned runways, and Cold War history make Željava a fascinating destination for military history enthusiasts, photographers, and urban explorers.