The first radon spa of the world. The springs are taken from Jáchymov mine called Svornost, their temperature being 28°C - 30°C. At present, 4 springs are used for curing purpose, i.e. Curie spring, Academician Běhounek’s spring, C-1 spring and Agricola spring (bored in 2000). Diseases of movement apparatus, vessels diseases and disorder of metabolism are treated here. The main curing method are the radon baths.