A student flat of only 10 square meters is currently exhibited at the Virserum Art Museum in the county Småland, Sweden.
Architecture Student 75 Sq. Ft. Micro House
Talk about a great insulator - earth!
HOUSE PLANS - underground dome home, think Hobbit house :)
Drawing of a berm house with green roof and water catchment/cistern.
If I ever have land, I'm going to build a few of these for my kids as they become young adults but aren't ready to go into debt for a place of their own. They can go live in a drain pipe out back for awhile. Woo-hoo!
The earth's warmth can be used to protect people from excess cold, as in this cob house with sod roof | How To Build An Underground, Off-Grid, Virtually Indestructible Home | #DIY Tiny Homes
How to Build an Underground House Starting at $50 (video)
Customize Your Outdoor Spaces - 33 DIY Fire Pit Ideas - DIY & Crafts