File photo taken in 2007 shows part of Al-Hijr, also known as Madain Saleh, in Saudi Arabia. Described as the largest site of the Nabataean civilisation south of Petra in Jordan, Madain Saleh is the ... more 

File photo taken in 2007 shows part of Al-Hijr, also known as Madain Saleh, in Saudi Arabia. Described as the largest site of the Nabataean civilisation south of Petra in Jordan, Madain Saleh is the first Saudi archaeological site to be inscribed on UNESCO's World Heritage List less