In Finland saunas are a way of life. In a country of roughly 5 million people you will find million saunas.
Ready for sauna, birch twigs with fresh leaves to gently slap the back for a wonderful feeling
A little cabin in the woods. I know it's not a tree house, but it is in the woods.
Karelian granny's hand-carved sauna in Hauho.
A modern master's sauna Famed Finnish architect Alvar Aalto's 1954 savusauna is traditional in form, with subtle modernist touches: the logs are tapered to create the gently pitched roof, and the footprint isn't square, but trapezoidal.
Sauna, spa & wellness resort Elysium in Bleiswijk
Lazy days in the countryside
The barrel sauna
Elements of warming authentic Finnish sauna = kiuas + kindling + fuel (larger pieces of wood) + matches + a few pufs of air + patience.