Photo taken on May 18, 2013 shows a renovated sunken courtyard in Qucun Village of Zhangbian Township in Shaanxian County, Central China's Henan Province. The sunken courtyard, a kind of traditional residential construction in west Henan, has a high value in the study of local histroy, architecture, geology and sociology. The Qucun Village has 115 sunken courtyards, most of which are under protective reconstruction. (Xinhua/Zhao Peng) 

Photo taken on May 18, 2013 shows a renovated sunken courtyard in Qucun Village of Zhangbian Township in Shaanxian County, Central China's Henan Province. The sunken courtyard, a kind of traditional residential construction in west Henan, has a high value in the study of local histroy, architecture, geology and sociology. The Qucun Village has 115 sunken courtyards, most of which are under protective reconstruction. (Xinhua/Zhao Peng)

A construction worker renovates a sunken courtyard in Qucun Village of Zhangbian Township in Shanxian County, Central China's Henan Province, May 18, 2013. The sunken courtyard, a kind of traditional residential construction in west Henan, has a high value in the study of local histroy, architecture, geology and sociology. The Qucun Village has 115 sunken courtyards, most of which are under protective reconstruction. (Xinhua/Zhao Peng)

 Construction workers renovate a sunken courtyard in Qucun Village of Zhangbian Township in Shaanxian County, Central China's Henan Province, May 18, 2013. The sunken courtyard, a kind of traditional residential construction in west Henan, has a high value in the study of local histroy, architecture, geology and sociology. The Qucun Village has 115 sunken courtyards, most of which are under protective reconstruction. (Xinhua/Zhao Peng)

Construction workers renovate a sunken courtyard in Qucun Village of Zhangbian Township in Shaanxian County, Central China's Henan Province, May 18, 2013. The sunken courtyard, a kind of traditional residential construction in west Henan, has a high value in the study of local histroy, architecture, geology and sociology. The Qucun Village has 115 sunken courtyards, most of which are under protective reconstruction. (Xinhua/Zhao Peng)

Construction workers renovate a sunken courtyard in Qucun Village of Zhangbian Township in Shaanxian County, Central China's Henan Province, May 18, 2013. The sunken courtyard, a kind of traditional residential construction in west Henan, has a high value in the study of local histroy, architecture, geology and sociology. The Qucun Village has 115 sunken courtyards, most of which are under protective reconstruction. (Xinhua/Zhao Peng)