I don't think I have ever been in a sauna. They are pretty big in the Upper Peninsula of Michigan, but that isn't surprising as there is a lot of Finnish ancestry up there I think. I know people around here do something similar with hot tubs in the winter. They will sit in the hot tub then roll around in the snow, then go back in the hot tub.
Wherever there are Finns, they will build saunas. One of my supervisors works out of Dallas - has built a sauna at home.
The neighbor who invited me has a woodfired hot tub also. It is nice to be there in the winter and on occasion, the northern light are visible above.
Oh wow, that sounds awesome. My wife and I have been trying to see the northern lights for a while now. I have seen them a couple of times, but she never has. Up North in the UP, they have the circular style saunas made of cedar or whatever the wood is.
https://www.dewyseconstruction.com/index.php?page=Barrel_Saunas
They look pretty cool! The same guy from Dallas has his summer place with his brother in Finland, and it is buried underground. It is a smoke sauna - they have two others there also :D
Some sauna: https://sauna.fi/en/sauna-knowledge/a-good-smoke-sauna/
Nice!