Saunas, spaces built for intense dry or wet heat sessions, are standard fare at hotels, spas and gyms worldwide. In countries like Finland (where saunas were born 2,000 years ago), Italy, Germany, Switzerland, The Netherlands, Hungary & Poland, the rituals and facilities are often creative, deeply social and fabulous. But the sauna experience outside Europe can frankly be rather “meh”: an uninspired, lonely experience in a spa or condo basement “box.”