One of my favorite places in the entire world is Cade’s Cove of Tennessee. The buildings are famous for the fact that many are cantilevered form that use no nails in the entire structure. They have lasted for decades and are some of the first of its kind in the US, (although a European design).
The following link is to a page that details various buildings of Cade’s Cove and include some info about the cantilevered barns which have fascinated me for years.
Here is another link to pics of my favorite one: