Image: Lear21, CC BY-SA 3.0

East and West Berliners on top of the recently opened Berlin Wall, early November 1989.

Image: TD Architects

The rich world, developed world, first world or Western world by another name: the walled world.

Image source: Korean Culture and Information Service (Jeon Han), CC BY 2.0

The Demilitarized Zone (DMZ) between North and South Korea.

Image: ngel Gutirrez Rubio, CC BY 2.0

The 'Valla' in Melilla, where Europe touches Africa.

Image source: Duke Human Rights Center, CC BY 2.0

One of the 99 "Peace Walls" in Belfast, Northern Ireland.

Image source: Cedric31, GFDL

The expansion of Morocco's Berm, in six phases from 1982 to 1987.

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How will AI and robotics transform jobs of the future? - Big Think