Perspective: Around globe, walls spring up to divide neighbors

TIJUANA, Mexico (Reuters) - What do Tijuana, Baghdad and Jerusalem have in common?

They all have walls that divide neighbors, cause controversy and form part of an array of physical barriers around the world that dwarf the late, unlamented Iron Curtain.

There are walls, fences, trenches and berms. Some are reinforced by motion detectors, heat-sensing cameras, X-ray systems, night-vision equipment, helicopters, drones and blimps. Some are still under construction, some in the planning stage.

When completed, the barriers will run thousands of miles, in places as far apart as Mexico and India, Afghanistan and Spain, Morocco and Thailand, Malaysia and Saudi Arabia, and Iraq.

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