A very 21st Century piece of tech is being called in to save the crumbling Great Wall of China.
from BBC News - Home Drones called in to save the Great Wall of Chinahttps://https://ift.tt/2OVCZvI
from BBC News - Home Drones called in to save the Great Wall of Chinahttps://https://ift.tt/2OVCZvI
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