Al-Khaznah or the Treasury, Petra, Jordan
This ancient site, established possibly as early as 312 BCE as the capital city of the Nabataeans, it is a symbol of Jordan. It lies on the slope of Jebel al-Madhbah (identified by some as the biblical Mount Hor) in a basin among the mountains which form the eastern flank of Arabah (Wadi Araba), the large valley running from the Dead Sea to the Gulf of Aqaba. Petra has been a UNESCO World Heritage Site since 1985. The site remained unknown to the Western world until 1812, when it was introduced by Swiss explorer Johann Ludwig Burckhardt.
UNESCO has described it as "one of the most precious cultural properties of man's cultural heritage". Petra was named amongst the New 7 Wonders of the World in 2007 and was also chosen by the Smithsonian Magazine as one of the "28 Places to See Before You Die".