The 7  Wonders  of the world 

The Great Wall of China

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The Great Wall of China spans across 15 regions in north China

Beijing, Hebei, Heilongjiang, Jilin, Liaoning, Inner Mongolia, Tianjin,  Gansu, Shandong, Henan, Shanxi, Shaanxi, Ningxia, Qinghai, and Xinjiang.

and is said to be more than 2,700 years old.

The Great wall spans for more  than 21,196 km 

#Huge

(that's 13,170.70 miles)

Emperor Qin Shi Huang built the wall around around 221 B.C,  to defend China's northern border.

and no, you can't see it from the moon

The wall was built primarily from earth and stone - but had a suprising ingredient to give it it's superior strength....

Can you guess what was used?

Rice ! Yes, glutinous rice (aka sticky rice) has been found to be used due to its cohesive properties.

I know...right?