The most recent construction of the Great Wall of China, and most often referred to, took place in the Ming Dynasty (1368-1644). This portion covers an area of over 6,000 kilometers, or 3,728 miles.

Construction on the Great Wall of China, however, first began in 7th century B.C. In 221 B.C., the first emperor of Qin Dynasty linked the walls of the three states in the north and formed the first "Wan Li Chang Cheng" (ten thousand li Great Wall, 2li = 1km).

Since that time, there has been rebuilding, modification and extending of the Great Wall for over 2,000 years. If you include all of the walls built in different dynasties, the total length exceeds 50,000 kilometers, or 31,068 miles.

Here is a fabulous 360 Degree Tour of the Great Wall of China.
Source(s):
http://www.destination360.com
http://www.travelchinaguide.com
http://www.greatwall-of-china.com
http://www.chinahighlights.com/greatwall/

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1. The Great Wall was build during the Qin Dynasty (221BC - 206BC)
2. 300,000 soldiers built the wall
3. 1.8 million laborers were called up
4. 250 m of the Great Wall could be built in a year
5. 4,000 miles long
6. Height is 25 feet
7. Some stone height are two meters and weigh hundreds of kilograms. Carried by human labor.
Source(s):
http://www.travelchinaguide.com/china_great_wall/construction/labor_force.h...
http://www.buzzle.com/articles/facts-about-the-great-wall-of-china.html

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