Jordan Petra World Heritage. Al-Khazneh is one of the most elaborate temples in Petra, a city of the Nabatean Kingdom inhabited by the Arabs in ancient times. As with most of the other buildings in this ancient town, including the Monastery, this structure was carved out of a sandstone rock face. Al-Khazneh (the Treasury), The 39 m high and 25 m wide mausoleum dedicated to a Nabataean king or queen was hewn out of the rock probably during the second half of the reign of King Aretas IV (ruled 9 B.C. – 40 A.D.). The Arabic name “Khazneh al-Fira’un” (Pharaoh’s Treasury, short: al-Khazneh) originates from Bedouins who believed that an Egyptian pharaoh had hidden a treasure in the urn on the top. The Treasury at Petra.