Hegra (Mada'in Salih)

Hegra (Ancient Greek: Ἕγρα, Arabic: ٱلْحِجْر, romanized: al-Ḥijr), also known as Mada’in Salih (Arabic: مَدَائِن صَالِح, romanized: madāʼin Ṣāliḥ, lit. 'Cities of Salih'), is an archaeological site located in the area of Al-'Ula within Medina Province in the Hejaz region, Saudi Arabia. A majority of the remains date from the Nabataean Kingdom (1st century AD). The site constitutes the kingdom's southernmost and second largest city after Petra (now in Jordan), its capital city. Traces of Lihyanite and Roman occupation before and after the Nabatean rule, respectively, can also be found.

The archaeological site lies in an arid environment. The dry climate, the lack of resettlement after the site was abandoned, and the prevailing local beliefs about the locality have all led to the extraordinary state of preservation of Al-Hijr, providing an extensive picture of the Nabatean lifestyle. Thought to mark the southern extent of the Nabatean kingdom, Al-Hijr's oasis agriculture and extant wells exhibit the necessary adaptations made by the Nabateans in the given environment—its markedly distinct settlement is the second largest among the Nabatean kingdom, complementing that of the more famous Petra archaeological site in Jordan. The location of the site at the crossroads of trade, as well as the various languages, scripts and artistic styles reflected in the façades of its monumental tombs further set it apart from other archaeological sites. It has duly earned the nickname "The Capital of Monuments" among Saudi Arabia's 4,000 archaeological sites.

The Quran places the settlement of the area by the Thamudi people during the days of the prophet Salih, between those of Nuh (Noah) and Hud on one hand, and those of Ibrahim (Abraham) and Musa (Moses) on the other. However, a definitive historical chronology can not be obtained through the order of verses due to the fact that the Quranic chapters (see surah) deal with different subjects in non-chronologic order. According to the Quran, the Thamudis were punished by God for their idolatry, struck by an earthquake and lightning blasts. Thus, the site has earned a reputation as a cursed place—an image which the national government is attempting to overcome as it seeks to develop Mada'in Salih for its potential for tourism.

In 2008, UNESCO proclaimed Mada'in Salih as a site of patrimony, becoming Saudi Arabia's first World Heritage Site. It was chosen for its well-preserved remains from late antiquity, especially the 131 monumental rock-cut tombs, with their elaborately ornamented façades, of the Nabataean Kingdom.