These structures are found outside Taos, NM really was an
interesting and eyeopening adventure. We took the Tour (5 dollars) and
learned how and why things are done, and the end results of a
completed one is amazing.

Here's a few links to check out if your Interested.

http://earthship.com/

http://earthship.com/new-mexico

http://en.wikipedia.org/wiki/Earthship