In this photograph taken on Thursday, May 10, 2012, a foreign tourist visits the Abu Lawha, the largest Nabataean tomb at the desert archaeological site of Madain Saleh, in Al Ula city. The site is 1,043 km (648 miles) northwest of the capital, Riyadh, Saudi Arabia. Madain Saleh, also known as Al-Hijr, was added to UNESCO's World Heritage List on July 6, 2008. It is the largest conserved site of the Nabataeans civilization south of Petra in Jordan. Madain Saleh was the first World Heritage site in Saudi Arabia.[Photo/IC]