Renaissance seat of the Kuefstein family, Greillenstein leans into its eerie side with candlelit evening ghost tours that pass the old courtroom and museum rooms. Visitors whisper about footsteps in the galleries, while local lore links the Kuefsteins to 18th-century alchemical “spirits-in-jars” tales, adding occult flavor to a site already dotted with dwarf statues and a water-spouting dragon.