7. An Oculus Study

Designed by Spanish architect Santiago Calatrava. The structure is formed by softly-curving, white, steel ribs that rise from below the ground to form an elliptical dome over a vast concourse. The structure uses 11,500 tons of structural steel, and free from internal columns the concourse reaches a length of 350 ft and a height of 160 ft.

The transparency of the structure allows light to flood through onto the grey and white marble floors below, and a skylight that runs the length of the Oculus’ spine will open each September 11 to honour the memory of the victims.

Excerpt from https://www.designingbuildings.co.uk/wiki/The_Oculus