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PETRA, JORDAN - OCTOBER 20: Jordanians mount camels in front of he facade of Al Khazneh (the Treasury), built as a royal tomb and so called after a legend that pirates hid their loot in an urn inside, in historical Petra city of southern Jordanian governorate Ma'an on October 20, 2014. Being among UNESCO Intangible Cultural Heritage List since 1985, Petra is also listed as one of the New Seven Wonders of the World and lies on the slope of Jebel al-Madhbah 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 was built as the capital city of Arabic desert nomads Nabateans as early as 312 BC. (Photo by Bulent Doruk/Anadolu Agency/Getty Images)

PETRA, JORDAN - OCTOBER 20: Jordanians mount camels in front of he facade of Al Khazneh (the Treasury), built as a royal tomb and so called after a legend that pirates hid their loot in an urn inside, in historical Petra city of southern Jordanian governorate Ma'an on October 20, 2014. Being among UNESCO Intangible Cultural Heritage List since 1985, Petra is also listed as one of the New Seven Wonders of the World and lies on the slope of Jebel al-Madhbah 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 was built as the capital city of Arabic desert nomads Nabateans as early as 312 BC. (Photo by Bulent Doruk/Anadolu Agency/Getty Images)
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PETRA, JORDAN - OCTOBER 20: The facade of Al Khazneh (the Treasury), built as a royal tomb and so called after a legend that pirates hid their loot in an urn inside, is seen through the main entrance Siq in historical Petra city of southern Jordanian governorate Ma'an on October 20, 2014. Being among UNESCO Intangible Cultural Heritage List since 1985, Petra is also listed as one of the New Seven Wonders of the World and lies on the slope of Jebel al-Madhbah 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 was built as the capital city of Arabic desert nomads Nabateans as early as 312 BC. (Photo by Bulent Doruk/Anadolu Agency/Getty Images)

PETRA, JORDAN - OCTOBER 20: The facade of Al Khazneh (the Treasury), built as a royal tomb and so called after a legend that pirates hid their loot in an urn inside, is seen through the main entrance Siq in historical Petra city of southern Jordanian governorate Ma'an on October 20, 2014. Being among UNESCO Intangible Cultural Heritage List since 1985, Petra is also listed as one of the New Seven Wonders of the World and lies on the slope of Jebel al-Madhbah 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 was built as the capital city of Arabic desert nomads Nabateans as early as 312 BC. (Photo by Bulent Doruk/Anadolu Agency/Getty Images)
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PETRA, JORDAN - OCTOBER 20: Man rides horse in front of Obelisk Tomb which tops the Bab al-Siq Triclinium, one of many ancient buildings in historical Petra city of southern Jordanian governorate Ma'an on October 20, 2014. Being among UNESCO Intangible Cultural Heritage List since 1985, Petra is also listed as one of the New Seven Wonders of the World and lies on the slope of Jebel al-Madhbah 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 was built as the capital city of Arabic desert nomads Nabateans as early as 312 BC. (Photo by Bulent Doruk/Anadolu Agency/Getty Images)

PETRA, JORDAN - OCTOBER 20: Man rides horse in front of Obelisk Tomb which tops the Bab al-Siq Triclinium, one of many ancient buildings in historical Petra city of southern Jordanian governorate Ma'an on October 20, 2014. Being among UNESCO Intangible Cultural Heritage List since 1985, Petra is also listed as one of the New Seven Wonders of the World and lies on the slope of Jebel al-Madhbah 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 was built as the capital city of Arabic desert nomads Nabateans as early as 312 BC. (Photo by Bulent Doruk/Anadolu Agency/Getty Images)
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Petra, Ma'an Governorate, Jordan, February 7, 2014. -- Petra is a historical and archaeological city in the southern Jordanian governorate of Ma'an that is famous for its rock-cut architecture and water conduit system. (Photo by Thierry Tronnel/Corbis via Getty Images)

Petra, Ma'an Governorate, Jordan, February 7, 2014. -- Petra is a historical and archaeological city in the southern Jordanian governorate of Ma'an that is famous for its rock-cut architecture and water conduit system. (Photo by Thierry Tronnel/Corbis via Getty Images)
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SHIRAZ, IRAN - OCTOBER 23: The tower knows as the Kabah of Zoroaster in Naqsh-e Rostam necropolis on October 23, 2015 in Shiraz, Fars Province, Iran. (Photo by Eric LAFFORGUE/Gamma-Rapho via Getty Images)

SHIRAZ, IRAN - OCTOBER 23: The tower knows as the Kabah of Zoroaster in Naqsh-e Rostam necropolis on October 23, 2015 in Shiraz, Fars Province, Iran. (Photo by Eric LAFFORGUE/Gamma-Rapho via Getty Images)
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Gamma-Rapho Eric LAFFORGUE