Juyongguan Great Wall (UNESCO Site # 438)

In c. 220 B.C., under Qin Shi Huang, sections of earlier fortifications were joined together to form a united defence system against invasions from the north. Construction continued up to the Ming dynasty (1368–1644), when the Great Wall became the world's largest military structure. Its historic and strategic importance is matched only by its architectural significance. (whc.unesco.org/en/list/438)

.

.

.

Many sections of the Wall are open to tourists. Our group visited Juyongguan Great Wall

...near Beijing suburb Nankou Town.
[youtube]ZclRbp2xYjs[/youtube]
During the walk along the wall, we climbed more than a hundred meters, passing 12 fortresses.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.