This cave courtyard home is in Sanmenxia, Central China's Henan Province. It is one of the four major types of ancient residential buildings in China. It was put on the national intangible cultural heritage list in 2011 and named a cultural heritage site under state protection in 2013. (Photos: People's Daily app/Shi Jiamin)

This cave courtyard home is in Sanmenxia, Central China's Henan Province.

Aerial photo shows cave dwelling courtyards in Sanmenxia, Central China's Henan Province.

Aerial photo shows cave dwelling courtyards in Sanmenxia, Central China's Henan Province.