Still found mostly at spas outside of the United States, salt therapy is widely considered beneficial to health in Europe, with possible positive effects for aging skin, asthma, allergies and respiratory ailments. In Poland, health resorts and wellness centers offer salt-based treatments including breathing salt-infused air. Intrigued? Try it for yourself in the natural salt caves found in Wieliczka, where subterranean tunnels have been converted into a therapeutic center where guests stay for seven-hour stretches to breath in purified air, supervised by a team of physicians and physiotherapists.

Other health resorts in Poland offering salt therapy — some in purpose-built caves — include Ciechocinek, Konstancin-Jeziorna, Iwonicz and Busko-Zdroj. At the beautiful, modern facility at Słoneczny Zdrój Medical Spa & Wellness Hotel in Busko-Zdroj, naturally occurring mineral springs are a highlight. Services and therapies in 39 treatment rooms include traditional balneotherapy, physiotherapy and kinesiotherapy. Along with water-based therapies, there’s a menu of decadent spa treatments, and a wellness center fitted with a pool, Jacuzzi and two saunas.