The wall is the longest man-made structure in the world, with a total length of about 13170.7 miles (21,196.19 km).

Transporting the large quantity of materials required for construction was difficult, so builders always tried to use local resources

Transporting the large quantity of materials required for construction was difficult, so builders always tried to use local resources

Stones from the mountains were used over mountain ranges, while rammed earth was used for construction in the plains.

The human cost of the construction is unknown

Before the use of bricks, the Great Wall was mainly built from rammed earth, stones, and wood

During the Ming, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone.

During the Ming, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone.

The Great Wall of China became a UNESCO World Heritage Site in December 1987.

The wall is made up of earth and stone, it stretches from the China seaport of Shanhaiguan into Gansu province.

The wall was built to protect and unite territories of Chinese states and empires against various nomadic groups of the steppe.

The Great Wall of China is estimated to be 2,300 years old

It is in the list of the seven wonders of the world.  

the Great Wall of China is the longest feat of human engineering

Nearly all of the rest (about 70 % of total length) is actual constructed wall, with small remaining stretches constituting ditches or moat.s

 Great Wall Of China is the longest structure ever built.

The Great Wall was not all built at the same time. The first sections were built in the 7th century B.C.

Over 10 million people a year visit the Great Wall of China.