Drone footage shows the enormity of what is considered to be the world's biggest cemetery in Najaf, Iraq.
The Wadi al-Salam Islamic cemetery contains more than 5 million graves, spanning 602 hectares.Its name translates as the "Valley of Peace", and according to the BBC the majority of those interred are Shia Muslims.It is understood more recent burials have been for victims of the so-called Islamic State terrorist group.