After 11 Sept 2001, when World Trade Centre was destroyed, Skidmore, Owings & Merrill (who have designed Burj Khalifa) and David Childs built a new building called One World Observatory or Freedom Tower. It is the 4th tallest building in the world and tallest in the western hemisphere.
On its 100-102 floors there is an Observatory with exhibits & restaurants. If you are in New York, you can’t and shouldn’t miss this opportunity to see New York city from 102 floors above.
It is difficult to describe this surreal experience in world as you can see from the pictures I took.