Palmyra arch destroyed by Isil rises over Trafalgar Square

A near-perfect replica of a Roman triumphal arch from the ancient city Palmyra that was destroyed by Isil militants in Syria last year will go on display for three days in Trafalgar Square, London, from today, 19 April.The 15m-tall structure has been cut from marble by computer-controlled drills. By superimposing multiple photographs of the now vanished arch onto the marble, specialists were able to create a 3D model of the monument to guide the machine reconstruction, a process known as 3D mac