3. Okinawa Tree House, Onoyama Park, Japan
Source: Inhabitat
It’s a tree house, set in a busy area and in a tree that looks like a giant hand. This tree house isn’t actually on a tree, but rather a man-made sculpture made to look like a tree. You’ll find local foods here, but the tree house, in the overcrowded area where greenery seems so little, is quite out of place.