Gasteiner Heilstollen - Bad Gastein, Austria

Fürstenzeche Bergwerk - Lam, Germany

Radium Palace (1912) - Jachymov, Czech Republic
Behounek’s Sanatorium (1977) - Jachymov, Czech Republic
Curie Sanatorium (1992) - Jachymov, Czech Republic

Kurmittelhaus Sibyllenbad - Neualbenreuth, Germany

Kurbad Schlema - Schlema, Germany

Wieliczka Salt Mine - Wieliczka, Poland

Republican Speleotherapeutical Hospital - Armenia
4,000 square meters of corridors, 235 meters below the surface for asthma and other respiratory disorders

Guarapari, Brazil - Atlantic coasts of Brazil are covered with sand that originated from nearby naturally radioactive monazite and zirconite hillsides.=

Keywords: speleotherapy, hormesis, low dose radiation