a speleocamera, a halochamber with sunbeds, a medical spa procedure recreates the microclimate of salt caves, the air is saturated

air architecture beautiful beauty building cave caves chloride corridor dark deep europe female for girl halochamber health history illuminated improving industry ions leisure light lying medical meditation microclimate mine mining museum natural nature old outdoors passage people pit poland procedure recreates relaxation rest rock room salt salty sand saturated sodium spa spain speleocamera stone structure sunbeds travel tunnel underground wall wieliczka women wood young