A big sauna with a huge window looking out on the forest and the outdoor hot tub that's big enough for many people to warm up from the cold. This could also be used as a cold pool for dunking after sweating in the sauna.

15 m2 (162 sq ft) Noemi model from Swedish manufacturer Ekenäs Hus

A guest house - or a writing room? 15 Noemi model from Swedish manufacturer Ekenäs Hus

The residence of Finnish designer Eero Aarnio features a compact sauna.

The heatsource centered. Residence of Finnish designer Eero Aarnio features a compact sauna. Photo by: Joanna Moorhouse

Sauna

A little cabin in the woods. I know it's not a tree house, but it is in the woods.

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