Feature of world ' s strangest city which has just come under British mandate ' Pharoh ' s treasury ' , or the Temple of El Khasneh , at Petra . This rock hewen temple of Isis was probaly erected by the Emperor Hadrian when he visited Petra in 131 AD . The wonderful pink city of Petra comes under British Mandate in the annexation to Trans Jordania of the Hedjaz districts of Maan and Akaba 14 October 1925