Sauna appeared for return of century III before Christ.
In mountains of the region of the Finlândia, a group of woodcutters looked shelter for the cold.
Observing it washes that she was expelled for volcanos, them had constructed a hut of closed rock in oven form.
They had stoked fire to the firewood, and after a period of 8 hours, them they had left smoke to escape and they had entered in the hut.
After warm, the diving in the water of refreshed them to the lakes and caused a thermal shock.