From the Great Wall of China to the Southwest border: A historical guide to separation walls

A separation barrier/defensive wall is designed to limit the movement of people across a certain line or border, or to separate lands in order to protect people or cultures. They have been used for many thousands of years and built in a variety of materials, shapes and scales. Here are some famous examples and their maximum height to scale:

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Sources: Jon Henley: An illusion of security from Berlin to the West Bank,, UNESCO and the Federation of American Scientists | Richard Johnson/The Washington Post July 17, 2015
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