“simple and so amazing”
I have seen some of those, people that lived there invited me in. Amazing. A must see. This is one of the most ecofriendly way of living that exist ! Forget your AC, go get a cave !
Unsophisticated, naive mud made cave dwelling is very popular to the suburbs of xi'an. It can provide good cool condition in the Summer, keep hoster warmer in the winter. That can reflect the daily life of the local farmer in the countryside of xian.
There are more than 30,000,000 farmers still live in the caves,coll in summer and warmer in the winter. If you visit some place special,don't miss this.