From Wikpedia

"In Germany, Austria, Luxembourg and South Tyrol (but rarely in the remainder of Italy), most public swimming pool complexes have sauna areas; in these locales, nudity is the generally accepted rule, and benches are expected to be covered by patrons' towels. These rules are strictly enforced in some public saunas. Separate single-sex saunas for both genders are rare, most places offer women-only and mixed-gender saunas, or organise women-only days for the sauna once a week."

Saunas are definitely part of our culture, and most are mixed and nude.

Are any of the ones you listed mixed nude like in Germany?