The three sites are related to Daoism and two of its
main historical proponents--Laozi (Lao Tzu), and  
Zhuangzi (Chuang Tzu).
Beijing, China.
Laozi wrote the Dao De Jing.
Zhuangzi (Chuang Tzu) lived and died.
Baiyun Daoist Temple
Hangu Pass
Zhuangzi Tomb
                oshobob  The Living Workshop                                
                                                      Dao Sites in China