Al-Hijr, also known as Madain Salih, is an archaeological site located in northwestern Saudi Arabia. It was the first UNESCO World Heritage Site in the country, recognized for its well-preserved rock-cut tombs and ancient inscriptions. The site dates back to the Nabatean civilization, which thrived from the 4th century BCE to the 2nd century CE. The name "Al-Hijr" means "the stony place" in Arabic, reflecting its rugged landscape. It is mentioned in the Quran as the dwelling place of the people of Thamud, who are known for their advanced stone-carving skills. Today, Al-Hijr attracts tourists and researchers interested in ancient history and archaeology.