Gastein Heilstollen Therapeutic Mine in Böckstein

A former mining tunnel beneath the mountain near Böckstein, accessed by a small train, where therapy is administered to patients lying down in warm, humid air rich with radon. This is not a spa but a medical facility requiring a referral and medical supervision, so a visit must be planned well in advance. For travellers, it stands out as something rarely seen anywhere else: a mine repurposed as a place of healing.