Banya

A banya is a Russian wooden house with a steam room. It is also refers to bathhouse. The banya has also a wood stove to make heat. The main idea of banya is to cause sweat in the bathers.
Usually, the banya (wooden house) is near a river. The bathers jump into the river to cool down after being in the banya.
History.
In 440 b.c.e., the Ancient Greek history writer Herodotus wrote about people who live in what is Russia today.
One early mention of the banya is in the "Königsberg Letopis." The first full description of a banya is in the East Slavic "Primary Chronicles" of 1113.
At some times in history, women would go to the banya to give birth to babies. After a funeral, the friends and family of a dead person sometimes go to a banya together.
Throughout Russian history, the banya has been used by people in all classes. Poor workers would get clean in a banya after work. Rich Russians sometimes had private banya. Sometimes, the bather will jump into a river or a pile of snow instead.
Today, banya have separate places for men and women. Bathers do not have to be naked.
Common rules.
Banya have three rooms: a changing room or "predbannik" where people change clothes, a washing room, and steam room or "parilka". 
If the banya is for men and women, bathers should wear bathing suits. If the banya has separate places for men and women, bathers are usually naked.
Process.
Banya are often hotter than 93°C.
Bathers sit on a small mat to protect their skin from the hot wood. Bathers usually wear felt hats while they sit in the banya. During the banya bath, bathers use a broom or besom. Bathers hit each other with the branches like a massage. Sometimes friends hit each other with branches. Sometimes a professional masseuse does. The last part of the banya is when someone throws a bucket of cool or cold water on the bather. 
The biggest difference between a banya and sauna are that the banya has steam and most saunas use dry air.
Health.
Starting in the 1800s, doctors and scientists decided to study the banya. They already had an idea that it was good for health. Most of their studies were not good by today's scientific rules, but they told many people to go to the banya for their health.
Folklore.
In Slavic mythology there is a spirit called a bannik that lives in the banya under the bench. The bannik throws hot water or hot rocks at rude bathers.