New book traces the pieces of steel salvaged from the World Trade Center

NPR's Scott Detrow speaks with Sam Holleran, one of the authors behind the new book Scattered Steel: the afterlife of the World Trade Center .

The top 3

  1. Three Tallest Buildings Ever Constructed: The current top three tallest buildings are the Burj Khalifa at 828 meters (2,717 ft), Merdeka 118 at 678.9 meters (2,227 ft), and the Shanghai Tower at 632 meters (2,073 ft).
  2. Pioneering Structural Innovations of the Original World Trade Center Towers: The original World Trade Center towers utilized a revolutionary 'framed tube' design with closely spaced exterior steel columns acting as a rigid structural web, and prefabricated modular column/spandrel assemblies for rapid construction.
  3. Iconic Tall Structures with Extended Construction Periods: The Sagrada Familia in Barcelona, a basilica designed by Antoni Gaudí, has been under construction since 1882 and is projected to be completed in 2026, while the Cologne Cathedral took 632 years to finish, and the Milan Cathedral spanned 579 years of construction.

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