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.
Image 5 of 6 from gallery of Villa Asserbo: A Sustainable, Printed House That Snaps Together. Villa Asserbo, a house whose printed pieces "snap" together, by Danish architects Eentileen. Photos via Fast Company.