He also was involved in such notable projects as a new master plan for the National Mall in Washington, D.C. and an expansion of Dulles International Airport in Virginia.

One World Trade Center rises in the background ... where he worked on projects including a new master plan for the National Mall, the Constitution Gardens park along the mall and the Four ...

While he was perhaps best known for his work on One World Trade Center, considered to be the tallest building in the Western Hemisphere, Childs also was instrumental in other important projects, ...