8. The Spruce Mountain Lodge
Winter girlies, this one’s for you. Spruce trees are tall and dark, and they make a treehouse feel like a proper mountain lodge — all cozy wood, campfire smoke, and snow on the roof. I built mine on a hillside so the platform sits half in the tree and half over the slope, with a chimney poking through the leaves. Inside: a furnace, a cauldron, and a window that frames the mountains. Spruce takes longer to gather than oak, so make a day of it. Hot cocoa encouraged.