Not just for grown-ups
Secret treehouse in the forests of Canada, built by two crazy love birds. via http://thehemloft.com/
Weebee Plans | Tumbleweed Tiny House Company
Straatlokaal by Rikkert Paauw and Jet van Zwieten
little house on wheels
Tiny house in San Clemente, Chile
Utter Inn, Västerås, Sweden: A hotel with only one guest room, complete with a bedroom below the water with windows for watching marine life.