Rubuta ci gaba don wannan sakin layi - Sakamakon juyin juya halin masana'antu, sauna ya samo asali don amfani da murhun katako na ƙarfe, ko "kiuas", tare da hayaki. Matsakaicin yanayin iska yana kusa amma wani lokacin ya wuce a cikin sauna na Finnish na gargajiya. Lokacin da Finns suka yi hijira zuwa wasu yankuna na duniya sun kawo su sauna kayayyaki da hadisai tare da su. Wannan ya haifar da ci gaban sauna, gami da murhun sauna na lantarki, wanda kamfanin Metos Ltd ya gabatar a 1938 a Vaasa. Kodayake al'adun sauna a zamanin yau yana da alaƙa da al'adun Finnish, juyin halitta na sauna ya faru kusan lokaci guda a duka Finland da ƙasashen Baltic suna raba ma'ana da mahimmancin sauna a rayuwar yau da kullun, har zuwa yau. Sauna ya zama sananne musamman a Scandinavia da yankunan Jamus na Turai bayan yakin duniya na biyu. Sojojin Jamus sun sami saunas na Finnish a lokacin yakin da suke yi da Soviet Union a kan Soviet-Finnish gaban WWII
, inda suka yi yaƙi a gefe guda. Saunas suna da muhimmanci ga sojojin Finnish da suka gina saunas ba kawai a cikin tantuna masu motsi ba har ma a cikin ɗakunan ajiya. Bayan yaƙin, sojojin Jamus suka koma da wannan al'ada zuwa Jamus da Austria, inda ta zama sananniya a rabi na biyu na ƙarni na 20. Al'adun sauna na Jamus ya zama sananne a kasashe makwabta kamar Switzerland, Belgium, Netherlands da Luxembourg.