Ruins of Željava Underground Airbase in Bosnia.

- Image ID: F5W6K3
Thomas Brock / Alamy Stock Photo
Image ID: F5W6K3
Željava Underground Airbase (Objekat 505), situated on the border between Croatia and Bosnia and Herzegovina under Plješevica Mountain, near the city of Bihać, Bosnia, was one of the largest underground airports in Europe.
Location: Željava, Bihać, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina