Slovenia, Predjama castle

Pradyama Castle, located in Slovenia's Inner Carniola, has a rich history dating back to 1274. Initially built in Gothic style, it was expanded by the Lueg family. Arizem Luiger, a notable figure, used the castle as a base against the Hapsburgs. After several reconstructions and ownership changes, the castle was nationalized post-WWII and is now a museum. It features a network of secret passages and caves, with a portion open to visitors.

What happened to the castle after World War Two?

Describe the purpose of the vertical natural shaft that Arizem ordered to be enlarged.