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Outside the town of Pölitz lie the ruins of what was once one of Germany's most important assets - a place that kept the German war machine moving.
Hidden in a remote mountainous forest is a structure nicknamed the Fly Trap or Hitler's Stonehenge. Researchers still have no definitive idea what it is.
When the Nazis took Ksiaz Castle, it wasn't for the view. Secret staircases and lifts were built, while underneath, a vast network of tunnels was taking form.