Alps

The Alps are one of the great mountain range systems of Europe, stretching from Austria and Slovenia in the east; through Italy, Switzerland, Liechtenstein and Germany; to France in the west.

Alps in The Man With the Iron Heart
In 1943, Reinhard Heydrich ordered that a system of caves be built at the base of the Alps. The Alps became a redoubt in 1945 when Germany fell to the Allies.