Drones called in to save the Great Wall of China November 20, 2018 at 03:11PMhttps://https://ift.tt/2OVCZvI A very 21st Century piece of tech is being called in to save the crumbling Great Wall of China.

A very 21st Century piece of tech is being called in to save the crumbling Great Wall of China.

from BBC News - World https://ift.tt/2QfWjbS