Korowai tribe of Papua, Indonesia

They live up in the trees to protect themselves from swarming mosquitoes, evil spirits, and of course, troublesome neighbours. The tribe uses labour-intensive measures to create each of their high-rise wooden homes atop trees.

Each house is sturdy enough to accommodate up to a dozen people. This also includes the towering ladder constructed to reach the tree house. The home itself boasts floors and walls made of tree bark and a roof lined with leaves.