The photo shows well-preserved security doors during the old times in Erqilou village in Daiyue district of Tai'an, Shandong province. [Photo/dzwww.com]

A traditional stone mill lies in front of a stone dwelling in Erqilou village in Daiyue district of Tai'an, Shandong province. [Photo/dzwww.com]

A lake in Erqillou village. [Photo/dzwww.com]