I saw the structure while I was on the train, and I got off at the next station and met people there that gave me access to their catacomb-like basement, which was used for ammunition storage during the war and also, at some point, to hide groups of Jewish refugees.
Vidi la struttura dal treno, quindi scesi alla stazione successiva e lì incontrai delle persone che mi fecero entrare in quel loro seminterrato stile catacomba, usato durante la guerra come deposito munizioni e anche, a un certo punto, come nascondiglio per profughi ebrei.