Total length (all sections)21.2 million m
13.9 millionDesk widths
8.7 quintillionCompton wavelengths
Including all branches and sections across multiple dynasties
Photo by Hanson Lu on Unsplash
Great Wall of China
The longest structure ever built by humans/Ancient Structures
Despite the myth, you cannot actually see the Great Wall from space with the naked eye. What you can see from ground level is an astonishing 21,196 kilometers of walls, trenches, and natural barriers built over multiple dynasties spanning more than 2,000 years. Roughly a third of the original wall has disappeared entirely, which is impressive given how much wall there was to lose.
Measurements
Average height7.5 m
417Ring diameters
625Aspirin tablets
1 billionCell membranes
Typical height of Ming Dynasty sections
Average width at base6.5 m
2.4 thousandthsGolden Gate Bridges
21.7Light-nanoseconds
148Oreo diameters
Average width at top5.5 m
3 tenthsBowling lanes
11.1 millionthsLake Michigan lengths
3.01Picnic table lengths
Wide enough for five horses to ride abreast
Estimated total mass3 trillion kg
40.9 trillionthsMoons
8.8 billionEmpty hot tubs
1 sextillionFruit fly eggs
Very rough estimate; approximately 3 billion tonnes of material
Approximate top surface area117 million m²
1.8 millionClassrooms
117 quadrillionHuman cell surfaces
Length multiplied by average top width
Highest elevation point1,534 m
34.1Unrolled toilet paper rolls
85.3 billionthsLight-minutes
5,113Celery stalks
At Huanglouyuan, Beijing