Sauna

A sauna is any room with a fireplace that is enclosed by walls and/or doors on all sides.

In game Sauna text:

A sauna is the place for giving birth, and it also is the place where the dead ones get their final wash before the burial ceremony. A sauna is place for washing up, relaxing, and healing. A sauna is also used for making smoked meat. The heart of the sauna is a big fire-place made from roundish stones. To heat up the sauna, a fire is burned in the fire-place until the stones are red-hot. Usually, this takes four to six hours. After that, wait until all the smoke goes out. Then people come in and climb up on the benches of the sauna. Applying the sauna scoop to toss some water on the hot stones will release pleasant steam into the sauna. The temperature is from 120 to 60 degrees Celsius. In the beginning, the sauna is the hottest, and it cools down slowly. A sauna with a good fireplace can stay hot for twelve hours. Occasionally it happens that a sauna is heated too much, or there might be something wrong with the fireplace, and the sauna building will catch fire (Note: this doesn't happen in-game, yet). In that case, the building will burn down very fast and there is nothing to do, unless one manages to stop the fire right in the very beginning. For that reason, saunas are usually built far enough from any other buildings so that a burning sauna won't spread the fire to the rest of the village.