Over 2,200 years after it was built, China's Great Wall continues to be a mystery, as new studies reveal that it could be almost 2.4 times longer than originally measured.

Archaeologists and mapping experts have found 43,721 sites related to the Great Wall structure crisscrossing the country, making its overall length to be at 21,196.18 km, according to the latest survey published by China's State Administration of Cultural Heritage.

Great wall of china

Keywords: great wall of china, great wall of china longer, China's State Administration of Cultural Heritage, great wall of china new fact, great wall of china gallery, great wall of china