World of walls: How 65 countries have erected fences on their borders – four times as many as when the Berlin Wall was toppled – as governments try to hold back the tide of migrants
US presidential hopeful Donald Trump has made plans for a wall along the border with Mexico – to keep out what he called 'criminals, drug dealers, rapists' – central to his inflammatory campaign.
Yet experts say there is little proof of their effectiveness in stopping people crossing borders.
In July, Hungary's right-wing government began building a four-metre-high (13 feet) fence along its border with Serbia to stanch the flow of refugees from Syria, Iraq and Afghanistan.
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