Walls Running Through History

Walls and fences are to keep things in or to keep things out. These things could be people or animals. There are all kinds of walls and fences, some dating back to the earliest civilizations.

The Great Wall of China

One of the greatest wonders of the world winds across deserts, grasslands, and mountains, stretching almost 6,700 km from the east to the west of China...

The whole article: Walls Running through History (pdf)