Frankly, I don't know if this is practical for any of you, but it's a type of construction that's too beautiful not to share. And honestly, this could be become more and more popular as trees become more scarce and we seek energy-saving, renewable materials in our buildings. But the best characteristic of this is the sheer natural beauty of these walls - they look like stone, granite, or marble.
It's called rammed earth. Where literally they take dirt, cement, water and pressure and create a solid, variegated, hardened material that impenetrable to insects and the weather. Considering it's thickness, it's also naturally insulating.
You must read this article to fully see the beauty of this material. It may not be for everyone but it certainly is stunning and fascinating.
[Editor note: The photo is from Terra Firma Builders ]