Best Hot Springs Around the World that are Earth’s Greatest Gift to Mankind Blue Lagoon, Iceland, a geothermal spa. The outdoor bath remains year round. The natural ingredients of the warm water: mineral salts, white silica, and blue green algae
Marble Cave, Chile Chico, Chile – The most spectacular caves network in the world and this Marble Cathedral is absolutely magnificent. It’s located in Patagonia, Chile on the second largest freshwater lake in South America, General Carrera.