1. The title, Lost city, was gained because Petra initially was home to 30k inhabitants and suddenly went downhill until it was rediscovered by a Swiss explorer.
2.Despite being a lost city, Petra went to obtain the title of UNESCO World Heritage Site in 1985.
3. The site also gained an essential spot in the New Seven Wonders Of The World In 2007.
4.Sources confirm the city was originated in 312BC, which means its the oldest city possible.
5. The entry fee to visit this monumental site is 50 JD