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.
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A sauna at Lehmonkärki resort, Finland.
Untreated sauna benches and panel walls can be blackened using the Supi Sauna Wax by Tikkurila. This water-soluble solution with natural wax is colourless but it can be tinted black.