Wisconsin’s seeing more saunas pop up, but heat bathing has been part of Upper Midwest culture for over a century. It’s largely thanks to the Finnish immigrants who settled along Lake Superior.

For eight years running, Finland has topped the World Happiness Report — but what exactly does it measure? Kotiharjun Sauna in Helsinki opened in 1928.Credit...Catherine Hyland for The New York Times ...

There’s a word in Finnish which evades translation: löyly. It’s commonly used to describe the steam that rises when water is poured onto hot stones in a sauna. But it also signifies spirit or life ...

Heritage house Iittala’s new sauna lounge combines 1970s nostalgia with the best of Finland’s contemporary design.