21 July 1910: On the Great Wall of China - contemplating more than a 1000 years of history. By 2015 it is estimated that almost a third of the wall has disappeared.
19 April 1930: An appeal to parliament to save Hadrian’s Wall brings the First Commissioner of Works to the north of England. The grey ribbon of the stone wall ties up a perfect view, a place where Iraqi peacekeepers once stood guard.
17 March 1936: The Maginot line - France’s Rhine defences.
14 August 1961: Demonstrators defy armed policemen at Berlin Wall as East Germany seals the border with the West - how the Guardian reported the decision to erect the wall. View pictures of Berlin during the cold war and now.
13 March 1981: The Belfast Wall - a monument to hate. Peace walls of Belfast - in 2009, more than 40 barriers remain in sectarian areas despite weapons decommissioning and devolution. Will Belfast ever have a Berlin Wall moment and tear down its ‘peace walls’?
24 June 2002: Back to the wall - Israel’s plan to build a 180-mile fence around the West Bank is part of a new strategy based on an age-old concept. In 2016, the country started work on a wall deep underground at the Gaza border.
1 November 2013: Razor wire on fence dividing Melilla from Morocco condemned as inhumane.
19 November 2013: Our walled world - Almost a quarter of a century after the Iron Curtain came down, mankind is building separation barriers at a rate perhaps unequalled in history - at least 6,000 miles in the last decade alone, according to Guardian analysis.
2 March 2015: Kenya to build a wall on Somali border to keep out al-Shabaab.
25 January 2017: Donald Trump signs order to begin Mexico border wall in immigration crackdown.
