Saudi Prince Alwaleed bin Talal (C) speaks during a press conference on May 11, 2017, in the Red Sea city of Jeddah.
The completion date for the world's tallest tower has been pushed back to 2019, a Saudi Arabian billionaire said, almost six years after launching the record-breaking project. / AFP PHOTO / Amer HILABI        (Photo credit should read AMER HILABI/AFP/Getty Images)