Description: Building 505 was the most expensive project built in ex-Yugoslavia. The construction begun in 1956 when Tito decided to build the most advanced underground airport in Europe, of curse in complete secrecy. The construction of Yugoslav military might lasted for 12 years and costed around 8 billion USD and has intensified after the Israeli-Arab war in 1967, where the Israeli air force destroyed most of the Arab Air Force aircraft.
