Schlossberg Tunnel System I Schlossberg Graz | Graz Tourismus https://www.graztourismus.at/graztourismus/de/sightseeing-kultur/sehenswuerdigkeiten/schlossbergstollen_shg_9390
The Schlossberg Tunnel System: 6.3 km of WWII air-raid shelters – now an experience space, museum, event venue, and access point to the lift.
In the Graz Schlossberg Museum, a multimedia Schlossberg model provides insights