With radon therapy in the radon gallery, Bad Kreuznach has a unique local cure in Europe. In a disused mercury tunnel, Bad Kreuznach has created the first tunnel in the world to be used for radon therapy. The air in the radon gallery contains the radioactive gas radon in low, absolutely harmless concentrations. It is produced from the metal radium, which is contained in the porphyry rock of the rock massif. In 1904, the pharmacist Dr. Karl Aschoff from Bad Kreuznach discovered the radioactive radiation in radon. Inhalation therapy has been used since 1912. It is prescribed on a case-by-case basis with a positive medical prognosis. Prescription is permitted for the following conditions: ankylosing spondylitis chronic polyarthritis with low activity degenerative diseases of the spine (spondylosis, spondylarthrosis, osteochondrosis) degenerative diseases of the joints (arthrosis) chronic gout soft tissue rheumatism The approval of the therapy says nothing about its effectiveness in general. The therapy requires a doctor's prescription. The therapy plan is determined in the Crucenia Health Center according to the doctor's instructions - if necessary with other treatments.