Visitors tour the world cultural heritage photography art exhibition in Hainan Museum in Haikou, south China's Hainan Province, June 13, 2020. The world cultural heritage photography art exhibition opened on Saturday, this year's Cultural and Natural Heritage Day. Since 2006, China has celebrated cultural heritage day on the second Saturday of June. In 2017, it was renamed Cultural and Natural Heritage Day. (Xinhua/Pu Xiaoxu)

A visitor tours the world cultural heritage photography art exhibition in Hainan Museum in Haikou, south China's Hainan Province, June 13, 2020. The world cultural heritage photography art exhibition opened on Saturday, this year's Cultural and Natural Heritage Day. Since 2006, China has celebrated cultural heritage day on the second Saturday of June. In 2017, it was renamed Cultural and Natural Heritage Day. (Xinhua/Pu Xiaoxu)

A visitor tours the world cultural heritage photography art exhibition in Hainan Museum in Haikou, south China's Hainan Province, June 13, 2020. The world cultural heritage photography art exhibition opened on Saturday, this year's Cultural and Natural Heritage Day. Since 2006, China has celebrated cultural heritage day on the second Saturday of June. In 2017, it was renamed Cultural and Natural Heritage Day. (Xinhua/Pu Xiaoxu)

Visitors tour the world cultural heritage photography art exhibition in Hainan Museum in Haikou, south China's Hainan Province, June 13, 2020. The world cultural heritage photography art exhibition opened on Saturday, this year's Cultural and Natural Heritage Day. Since 2006, China has celebrated cultural heritage day on the second Saturday of June. In 2017, it was renamed Cultural and Natural Heritage Day. (Xinhua/Pu Xiaoxu)

A visitor tours the world cultural heritage photography art exhibition in Hainan Museum in Haikou, south China's Hainan Province, June 13, 2020. The world cultural heritage photography art exhibition opened on Saturday, this year's Cultural and Natural Heritage Day. Since 2006, China has celebrated cultural heritage day on the second Saturday of June. In 2017, it was renamed Cultural and Natural Heritage Day. (Xinhua/Pu Xiaoxu)