These underground homes will get you thinking about alternative ways of living: http://theownerbuildernetwork.co/lj5j
a frame cutaway
The Dome Home by Timothy Oulton Designed within a lychee garden.
Sitka Spruce Tree House in Tlell Haida Gwaii (Queen Charlotte Islands, British Columbia).
Buried almost completely into the side of a hill, this Alpine home built by a Dutch architecture firm features both subterranean insulation and jaw-dropping, panoramic views.
The Mill by Julia Popova, via 500px
giant kids tree house in family backyard
Treehouse Point | (10 Beautiful Photos)
Underhill Valley Earth Huts, Hamilton Picture: Earth House at dusk - Check out TripAdvisor members' 1,107 candid photos and videos of Underhill Valley Earth Huts