Behold this amazing and once-secret war bunker in Konjic, Bosnia-Herzegovina, which has now become a billion dollar art gallery. Formerly used to house Yugoslavia’s Communist leadership, this u-shaped underground labyrinth is dug deep in to a mountain just miles outside Sarajevo. For now the bunker is used only on a biennial basis, but it will hopefully become a more permanent gallery space in this small, unsuspecting Eastern Bloc town.