Steam bath
Many groups of Native Americans, for example the Lakota, use steam baths, also called sweat lodges.  People from Europe have been writing about Native American sweat lodges since the 1600s. A sweat lodge is not only for getting the body clean; it is a spiritual thing to do.  A sweat lodge is a hut or tent with a pile of hot rocks in the middle.  A sweat leader keeps the rocks hot and sometimes pours water on top of them to make steam.  Sometimes the leader has everyone pray or sing.  People can stay in the sweat lodge for hours, sometimes going outside for a little while.