A replica of the 2000-year-old arch of triumph, destroyed by the Islamic State group in the ancient Syrian city of Palmyra last year, will be unveiled in London today. The replica has been built from marble with computer-controlled drill programmed with 3D images of the Digital Archaeology, the group behind the project, hopes the technology can be used to rebuild parts of Palmyra, which has been recaptured by goverment troops.