Every kid dreams about a treehouse. I still dream about one myself. If you are lucky to live in the country with a big garden or land, then it might be a dream that can become true if you're handy.
From my little urban backyard, I've been dreaming through the internet...
1. Mirrored Treehouse Hotel , Tham & Videgard
2. Curved Cabin Treehouse, BaumRaum
3. Tallest Treehouse, All That is Interesting
4. Yellow Restaurant Treehouse, Redwoods Treehouse
6. Spheres Treehouses, Free Spirit Spheres
(Images: as linked above)