Gone are the days when a treehouse was nothing more than a bunch of uneven wooden planks nailed together to a tree. Today, architects around the world are taking treehouses to a whole new level.

Now, you can stay in a classic two-story castle in the sky complete with a hot tub, an eco-village among the trees -- even a bird-house shaped treeehouse. 

From Japan to Tennessee, we found more amazing treehouses you can perch awhile and engage in life's more leafy pursuits.