The Coolest Earth Houses Around The World

image credit: Roland zh cc
An earth house (also known as an earth berm or an earth sheltered home) is an architectural style characterized by the use of natural terrain to help form the walls of a house. An earth house is usually set partially into the ground and covered with thin growth. Modern earth houses are built with concrete walls and insulation. Earth houses are some of the most energy efficient.
(thanks Veljko)