Humidity is the key, Finnish style sauna is low humidity+ high temperature (85-115C is OK i think), while Russian banya-style is low temperature (60-80C with high humidity). Both of them produce about the same load on a human
My problem with turkish style hammam is that unless it's extremely well maintained it often smells of mold. When I went to some nice hammams in turkey, I didn't have that problem but outside of turkey, it's often unbearable.
That's interesting. I don't have much the habit of doing sauna, as you can likely tell, so I might have tried only high humidity saunas. I'll give it a try one day with low humidity if I find one.
73°C isn't unusual. I checked out what's source for the Wikipedia article that says it's 80 to 110°C. Oddly it's a Chicago Tribune article from 1970. I don't think I ever visited a 110°C sauna.
110C is not that unusual in the Nordics (although way above average, it's for tougher sauna goers). I've been in one. Not most people's cup of tea though, the experience is comparable to the opposite of a long cold plunge.
A dry sauna sounds terminally boring. The point of Finnish saunas is that they are dry and hot, but you can adjust the pain...experience, I mean, by throwing water on the rocks at intervals of your choice.
This temperature cheating is one of the things I see very often in Gyms & public places:
They announce with "fin sauna 90°", and then its only 80 or 82,so stealing some performance :-D
I was in a 110C sauna for 20 minutes today. Plus 15 minutes in a 70C one (hybrid infrared sauna). Max is 30 minutes at once at 70C. It does take some getting used to.