Centuries ago, cities were known by their church steeples and towers, but with innovations in architecture, especially in steel frame technology and elevators, city skylines have transformed. Paul Goldberger, architecture critic for The New Yorker, shares a brief history.
For even more stories about tall buildings around the world, watch the NOVA special on Ground Zero, learn more from the Council on Tall Buildings and Urban Habitat or view the complete list of tall buildings at The Skyscraper Museum website.
NOVA: Engineering Ground Zero
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