Situated in the west of Bosnia on the border with Croatia, Objekat 505, as it was officially known, was the largest underground airport in the Balkans. The primary purpose of the Objekat 505 was to house a long-range radar early warning system, akin to NORAD, as well as to provide a strategic command center for the country’s defense.
Mauthausen-Gusen concentration camp grew to become a large group of Nazi concentration camps that was built around the villages of Mauthausen and Gusen in Upper Austria.
Grüner See (Green Lake) is a lake in Styria, Austria near the town of Tragöß. The lake is surrounded by the Hochschwab mountains and forests.