How long is the Great Wall of China?

Roughly half the length of the Equator! That measures in at 21,196.18 km (13,170.70 miles) .

When is the best time to visit the Great Wall of China?

The weather should play a key factor in deciding when you come to visit the Great Wall. AVOID THE SUMMER AT ALL COSTS! It's HOT, it makes an already tough job, much harder! Stick to Spring and Autumn months for the best temperatures.

Why was the Great Wall built?

Chiefly, the Great Wall has been used as a military defence throughout most of its long history. During its peak in the Ming dynasty the wall was guarded by more than 1 million soldiers.