Du Chengfeng clears the surface of a rock painting on the Leishan Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Du Chengfeng makes rubbing for a rock painting on the Leishan Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Photo taken on March 22, 2021 shows the Qilian Mountains in northwest China's Gansu Province. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Du Chengfeng takes the finished rubbing for a rock painting on the Yumu Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Du Chengfeng walks on his way to research on rock paintings on the Yumu Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Du Chengfeng views a rock painting on the Yumu Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

A rock painting is seen on the Yumu Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Du Chengfeng makes rubbing for a rock painting on the Leishan Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.

Du Chengfeng measures the size of a rock painting on the Yumu Mountain at Yugu Autonomous County of Sunan, northwest China's Gansu Province, March 22, 2021. Du Chengfeng, 45, was born from a herdsman's family. Just out of interest and passion, he has collected over 12,000 pieces of rock paintings on the Qilian Mountains in the past 20 years. He often spends over 100 days a year searching for various rock paintings in the deep mountain. Du began to work in the cultural sector in 2012. Under his suggestion, local authorities on administration of cultural heritage has enhanced efforts to protect the rock paintings, and kept paper and electronic edition for the existing rock painting data. Du said he wished to build a rock painting museum someday in future.