Passage: In 2008, UNESCO proclaimed Mada'in Saleh 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 rock-cut monumental tombs, with their elaborately ornamented façades, of the Nabatean kingdom.

Question: What is the first World Heritage Site in Saudi Arabia?
Mada'in Saleh