The sauna is a small room (usually with a wooden interior), which has a built-in heater or furnace to reach high temperatures. In the saunas peoples are exposed to hot dry air or steam and then alternately cool shower, snow, ice, jump into the icy lake. Sauna can also be a social event, where participants were able to sit in naked, and are based in a room heated to 80 ° C or more. In Finland, the sauna is very popular. A lot of houses has it, including our hostel. For summer time many people bought the island on which they have a small house with a sauna. They call it a summer cottage.