Mada'in Saleh, also known as Al-Hijr, is an archaeological site located in the Al-Ula Governorate. Its historical fame derives from its strategic location on the ancient trade route linking southern Arabia and the Levant. It is mentioned in the Qur'an as the home of the Thamud people who responded to the call of the Prophet of God. Saleh, then they abandoned their religion and stabbed the she-camel that God sent them as a sign, and he destroyed them with a shout. Mada’in Saleh is one of the most important Nabatean cities after their capital, Petra, as it contains the largest southern settlement of the Nabataean kingdom after Petra in Jordan, which is separated from it by a distance of 500 km. Its fall at the hands of the Roman Empire in 106 AD, and it is believed that Hegra continued its civilization until the fourth century AD, and was the capital of the Lihyan Kingdom in the north of the Arabian Peninsula. Today, the ruins of Madain Saleh include 153 carved rock facades, as well as a number of Islamic monuments, which are represented in a number of castles and the remains of the Hejaz Railway, which extends for a distance of 13 km, as well as the station and locomotives. In 2008, the site was registered on the UNESCO World Heritage List, becoming the first site to be registered in Saudi Arabia.