A 1784 circular brick tower in the grounds of the old Vienna General Hospital, originally a psychiatric institution and now a Pathological Anatomy Museum holding 50,000 medical specimens — among the largest such collections in the world. Wet specimens of every imaginable malformation, infection, and tumour fill the original cell-rooms in glass jars.
It is not for the squeamish. Guided tours run on certain days; check the schedule. Part of the Naturhistorisches Museum, but in a building completely different in spirit.