Wikipedia: "Saunas are an integral part of the way of life in Finland. They are found on the shores of Finland's numerous lakes, in private apartments, corporate headquarters, at the Parliament House and even at the depth of 1,400 metres (4,600 ft) in Pyhäsalmi Mine. The sauna is an important part of the national identity and those who have the opportunity usually take a sauna at least once a week. The traditional sauna day is Saturday.

The sauna tradition is so strong that whenever Finns go abroad, they relish the chance to have a good sauna: even the Finnish Church in Rotherhithe, London, has its own sauna. Finnish soldiers on peacekeeping missions are famous for their saunas.../... A Second World War-era Finnish military field manual states that a break of eight hours is all that is required for a battalion to build saunas, warm them and bathe in them.[citation needed] Saunas, even in the military, are strictly egalitarian places: no titles or hierarchies are used in the sauna."