10. The Fairy Door Garden Wall
This is the smallest build on the list and maybe the cutest. I built a mossy stone wall along the back of my garden, then tucked tiny doors into it — little trapdoors painted pastel, a flower pot beside each one, a tiny path leading up to it. The idea is that fairies live behind the wall and come out at night. Silly, but every time I walk past it I smile. A couple of mushrooms and some glow lichen make it look magical after dark. Twenty minutes, and it might be the best thing in my whole world.