Jeddah Tower: a 1km Tower Racing Past the height of Burj Khalifa

 https://www.youtube.com/watch?v=yc6XCr3TNSA 

Building the World’s Second Tallest Skyscraper https://www.youtube.com/watch?v=xyKTboWXRdY 

Why New York's Skyscrapers Keep Changing Shape https://www.youtube.com/watch?v=Yy8tDcdUUJY