China's Great Wall: How technology is helping to restore it.
The Jiankou section of the wall ribbons over top mountains for 20km (Credit: Amanda Ruggeri)
Built in the 1500s and early 1600s, the Jiankou section was left untouched for centuries (Credit: Amanda Ruggeri)
Some trees have been left to grow in the restored section of the Jiankou wall (Credit: Amanda Ruggeri)
Mules carry sacks of white ash to the Jiankou restoration site (Credit: Amanda Ruggeri)
The Jiankou project team can more closely replace bricks in their original locations (Credit: Amanda Ruggeri)
3D mapping and a computer algorithm offer engineers valuable information about the wall (Credit: Peking University)
Workers' days include a hike up the mountain and manual labour at the site (Credit: Amanda Ruggeri)
Certain parts of the restored Jiankou wall have been left wild (Credit: Amanda Ruggeri)
The technology piloted at the Jiankou restoration is now being used at other Great Wall projects (Credit: Amanda Ruggeri)