The Great Wall of China

It's ofttimes said that the Prototypal Emperor of Qin built the Enthusiastic Protect. Actually he was not the premier to habitus it.

See beneath:Why the Major Stratum Was Built

To keep encroachment
To protect Silk Route merchandise
In the Qin Royalty, the Basic Sovereign of Qin inked the northern walls to keep invasion from blue nations. In the Han Royalty, the emperors sprawled the Major Paries far into today's western Prc to protect Silk Agency switch.
The regal Zealous Protect was collective with good, dedication, blood, sudor, and tears. Families were unconnected, and umteen workers died and were interred as line of the Uppercase Paries itself.

Workers:
soldiers, peasants, rebels
Materials: jurist, alter, smoothen, brick
Physical delivery: by partner, rohypnol, cart, victim
Translate more on How the High Stratum Was Collective - Materials and Methods: See who the workers were, their thinking techniques, and how they moved the brobdingnagian amount of materials.
The High Support was not just a wall. It was an interracial force protective method with watchtowers for surveillance, fortresses for enjoin posts and logistics, pharos towers for discipline, etc.

In the Dynasty Royalty (1368-1644), the Uppercase Surround was reconstructed to be stronger and author refined, due to alter thought techniques beingness matured.

The palisade body: The Dynasty Large Protect unremarkably had battlements 1.8 meters (6 feet) last with loopholes and crenels, and breastwork walls 1.2 meters (4 feet) luxuriously.
Flanking towers: Every 500 meters or less (1,640 feet) on the Majuscule Palisade there was a flanking lift allowing defenders to germinate arrows at attackers at the surface of the fence.
Fortresses were collective at important/vulnerable way points (passes), much as Shanhai Advance Fort, Juyong Hand Fort, and Jiayu Licence Fort. There were galore archery windows and entrepreneur on the forts. The defense gatehouses were the strongest and most secure structures on the Uppercase Palisade.
"Sterling Hominian Effort in History": The Uppercase Fence is the building labor with the long period and superior cost in frail lives, execution, pass and tears. It deserves its guess among "the New Seven Wonders of the Humankind" and the UNESCO Grouping Acquisition Sites.