Mada’en Saleh, also known as Al Hijr, is a series sandstone outcrop of various sizes and heights surrounded by a ring sand mountains. It is a pre-Islamic archaeological site located in the Al-Ula sector, within the Al Madinah Region of Saudi Arabia. Al Hijr was mentioned in the Holy Qur’an, as the home of the Thamud people. Mada’en Saleh is the most important settlement of the Nabataeans, second only to Petra. It’s most significant cultural role dates back to the first century B.C. and first century A.D., i.e., during the flourishing Nabataean state and before its fall at the hands of the Roman Empire in 106 A.D. Al Hijr continued to be a source of cultural energy and intellectual interaction probably until the 4th century A.D.