- These days, you'll find tree houses everywhere from Sweden to South Africa
- The Aviary is located on Massachusetts parkland designed by Frederick Law Olmsted
- A South African tree house hotel overlooks the Tsitsikamma Forest
(CNN)Want to go out on a limb for your next vacation -- literally? Once the sole province of young boys and Ewoks, tree houses offer adventurous travelers (read: unafraid of heights) a unique travel experience in an age of roadside motel chains and globe-stretching hotel corporations.