One of the most recognizable symbols of China, the Great Wall of China has a long and complicated

history.

It is not just one wall, but many different walls and fortifications that were built over

the course of thousands of years.

The walls built at different times were often built with different materials, everything

from packed dirt or wood to stone and brick.

These walls were meant to protect China from invasion.

The earliest walls were built more than two thousand years ago when individual states

built walls of packed earth and gravel between boards to protect their territories from attackers

with swords and spears.

Hundreds of years later in 221 BC the first Emperor of China, Qin Shi Huang, ordered that

walls that divided his empire should be destroyed and a new wall connecting the remaining pieces

should be built, creating fortifications that protected the empire from northern attackers.

No one knows exactly how long that wall was or where it was built, as most of it has worn

down or been destroyed.

Over the next thousand years, different ruling dynasties repaired, rebuilt, or expanded sections

of the wall.

The leaders of the Ming dynasty, which began in 1368, constructed the most famous version

of the Great Wall.

They began by building watchtowers and garrisons, later adding walls of stone and earth.

New construction on the wall ended in 1644.

At its height the Great Wall stretched more than 13,000 miles or about 22,000 kilometers

in total length, making it the longest structure ever built by humans.

In some places the walls were 30 feet or 9 meters thick, and 25 feet or 7.5 meters tall,

and it was studded with as many as 25,000 watchtowers.

You may have heard that the Great Wall is so big that it can be seen from space, but

that is only partially true.

It cannot be seen at all from the moon, but from a much closer orbit it could be seen

by someone who knew exactly where to look and what it would look like.

Today the Great Wall of China is a World Heritage site, protected and maintained for all of

humanity to enjoy.

Only some pieces of the wall are taken care of, however, as it is simply too big and too

damaged by time and old battles to repair and take care of it all.

In fact, nearly 1/3 of the wall has completely disappeared, fallen down and even the stones

taken away by local people to use in building.

Still, the Great Wall is the most popular place for tourists to visit in China, attracting

millions of people each year.

I hope you enjoyed learning about the Great Wall of China today.

Goodbye till next time!