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Petra, Jordan: Treasury and Great Temple
http://www.sacred-destinations.com/jordan/petra-great-temple
https://www.khanacademy.org/humanities/ancient-art-civilizations/nabataean/a/petra-urban-metropolis
https://www.khanacademy.org/humanities/ancient-art-civilizations/nabataean/a/petra-the-rose-red-city-of-the-nabataeans