Sweat lodge
Overview
The sweat lodge is a ceremonial
Ceremony
A ceremony is an event of ritual significance, performed on a special occasion. The word may be of Etruscan origin.-Ceremonial occasions:A ceremony may mark a rite of passage in a human life, marking the significance of, for example:* birth...

 sauna
Sauna
A sauna is a small room or house designed as a place to experience dry or wet heat sessions, or an establishment with one or more of these and auxiliary facilities....

 and is an important event in some North American First Nations
First Nations
First Nations is a term that collectively refers to various Aboriginal peoples in Canada who are neither Inuit nor Métis. There are currently over 630 recognised First Nations governments or bands spread across Canada, roughly half of which are in the provinces of Ontario and British Columbia. The...

 or Native American
Native Americans in the United States
Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii. They are composed of numerous, distinct tribes, states, and ethnic groups, many of which survive as...

 cultures. There are several styles of sweat lodges that include a domed or oblong hut similar to a wickiup, or even a simple hole dug into the ground and covered with planks or tree trunks. Stones are typically heated in an exterior fire and then placed in a central pit in the ground.
Early occurrences can be found in the fifth century BC, when Scythians constructed pole and woolen cloth sweat baths.

Vapour baths were in use among the Celtic tribes, and the sweat-house was in general use in Ireland down to the 18th, and even survived into the 19th century.
 
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