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Petra (Greek "πέτρα" (petra), meaning stone; Arabic: البتراء, Al-Batrāʾ) is a historical and archaeological city in the Jordanian governorate of Ma'an that is famous for its rock cut architecture and water conduits system. Established sometime around the 6th century BC as the capital city of the Nabataeans, it is a symbol of Jordan as well as its most visited tourist attraction. It lies on the slope of 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. It was described as "a rose-red city half as old as time" in a Newdigate Prize-winning poem by John William Burgon. UNESCO has described it as "one of the most precious cultural properties of man's cultural heritage". Petra was chosen by the BBC as one of "the 40 places you have to see before you die".

New 7 Wonders of the World (2001-2007) was an initiative started in 2001 by the Swiss corporation New7Wonders Foundation to choose Wonders of the World from a selection of 200 existing monuments. A popularity poll was led by Canadian-Swiss Bernard Weber and organized by the New7Wonders Foundation based in Zurich, Switzerland, with winners announced on July 7, 2007 in Lisbon. The New7Wonders Foundation is regulated by the Swiss Federal Foundation Authority as all nationwide-active foundations in Switzerland are. It was the first in a planned series of lists; in 2007 the foundation launched New7Wonders of Nature, which was the subject of voting until Nov. 11, 2011. New7Wonders Cities is the next project.

The New7Wonders Foundation claimed that more than 100 million votes were cast through the Internet or by telephone. Nothing prevented multiple votes, so the poll was considered "decidedly unscientific". According to John Zogby, founder and current President/CEO of the Utica, New York-based polling organization Zogby International, New7Wonders Foundation drove "the largest poll on record".

The program drew a wide range of official reaction. Some countries touted their finalist and tried to get more votes cast for it, while others downplayed or criticized the contest. After supporting the New7Wonders Foundation at the beginning of the campaign, by providing advice on nominee selection, the United Nations Educational, Scientific, and Cultural Organization (UNESCO) distanced itself from the undertaking in 2007.

Al Khazneh ("The Treasury"; Arabic: الخزنة‎) is one of the most elaborate buildings in the ancient Jordanian city of Petra. As with most of the other buildings in this ancient town, including the Monastery (Arabic: Ad Deir), this structure was also carved out of a sandstone rock face. It has classical Greek-influenced architecture, and it is a popular tourist attraction.