Earth Architecture
Rammed earth is a technique for building walls, foundations, and floors using natural raw materials such as earth, chalk, lime or gravel. It is an ancient building method that has seen a revival in recent years as people seek more sustainable building materials and natural building methods.
Image Credit of Ancient Rammed earth in Morocco by @heditravels
Building a rammed-earth wall involves compressing a damp mixture of earth that has suitable proportions of sand, gravel and clay (sometimes with an added stabilizer) into an externally supported frame or mould, creating either a solid wall of earth or individual blocks,
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References
https://en.wikipedia.org/wiki/Rammed_earth
http://www.earthwallbuilders.com/
http://www.rammedearthisrael.com/
http://inhabitat.com/award-winning-rammed-earth-home-in-spain-halves-normal-co2-emissions/