There are over 100 homes carved in to this hillside. They were occupied around AD 618-907. Some show the remains of heated living rooms and beds known as kang.
Guyaju, China
naturalhomes.org
These caves were occupied about 1,100 years ago by the Xiyi people who used an early version of central heating to keep warm.
from Home Services Blog http://www.facebook.com/naturalhomes/posts/740176832702050
from Tumblr http://msalexandrakpierson.tumblr.com/post/101938361388
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