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.
Small place in Sweden. "Traditional ritual involves baking the sauna together, and dashing out for a refreshing dip in cold water. To make the process a perfect small pond was built adjacent to the sauna. Beside the pool there is a small garden near it.