The cave homes of Guyaju (Guyaju meaning, ancient cliff dwelling) are about northwest of Beijing, China. They were occupied during China's Tang Dynasty (AD by the Xiyi people. There are over 100 homes carved in to the hillside.
This is a hempcrete cottage. Hempcrete is a mixture of hemp and lime, a lightweight construction material that can be used for walls, insulation of roofs and floors and as part of timber-framed buildings.