Quick Answer
How long is the Great Wall of China? How old is it, why was it built, and can you really see it from space? The essential facts — and how to visit.
Why it matters
A 2012 archaeological survey put the total length — counting every branch, trench and natural barrier built over many dynasties — at about 21,196 kilometres (13,171 miles) . The best-preserved Ming-dynasty wall alone runs roughly 8,850 km.
TL;DR (Quick Answer)
- Length: about 21,196 km (13,171 mi) including all branches built across dynasties.
- Age: earliest walls date back over 2,000 years; most surviving sections are Ming dynasty (14th–17th century).
- Why: defence against northern nomadic invasions.
- Visit it: see our Great Wall tour guide.
How Long Is the Great Wall of China?
A 2012 archaeological survey put the total length — counting every branch, trench and natural barrier built over many dynasties — at about 21,196 kilometres (13,171 miles). The best-preserved Ming-dynasty wall alone runs roughly 8,850 km.
How Old Is It?
Sections of defensive wall were first built more than 2,000 years ago during the Warring States period and unified under the first emperor, Qin Shi Huang, around 220 BC. The grand, brick-faced sections most visitors see today were built during the Ming dynasty (1368–1644).
Why Was the Great Wall Built?
Primarily for defence — to keep out raiding nomadic peoples from the north — but it also served as border control, a way to levy duties on Silk Road trade, and a communication line via beacon towers.
Can You See It From Space?
It's a popular myth, but no — the Great Wall is generally not visible to the naked eye from low Earth orbit, because it's narrow and roughly the colour of its surroundings.
How to Visit the Great Wall
The best-restored, most scenic sections near Beijing are Mutianyu and Jinshanling. Read our guide to choosing a section, do it on the 4-Day Great Wall Adventure, or as part of the Golden Triangle. Browse all history tours.
FAQ
How long is the Great Wall of China?
About 21,196 km (13,171 miles) in total across all dynasties, according to a 2012 survey; the main Ming-dynasty wall is roughly 8,850 km.
How old is the Great Wall of China?
The earliest sections are over 2,000 years old (around 220 BC), while most surviving wall is from the Ming dynasty (1368–1644).
Can you see the Great Wall of China from space?
No — contrary to the myth, it isn't visible to the naked eye from space because it's narrow and blends with the landscape.
Why was the Great Wall built?
Mainly for defence against northern nomadic invasions, as well as border control and protecting Silk Road trade.
